First off, a disclaimer - I'm not an application developer, but a (amateur, technically speaking, since I'm not getting paid for this) web designer/developer. I use a lot of icons in my projects, but since I'm on a budget of $0.00, I have a fairly large collection of icons obtained from the internet, so I feel that I should have some say on this matter.
Automatically Generating your Icons
Automatically generated icons are a big no-no for me. Unless your application is a fractal generator, the generated icons usually won't fit the application. You're better off sticking to the plain or if you're using this.
Free Icons
Free icons are pretty good if you don't need anything too fancy. You didn't mention anything about whether the projects are commercial in nature, because legality is a big factor in determining what you can use. Also remember that in Vista/Windows 7 icons can go as big as 256x256 - icons of that size are not usually available for free icons.
In terms of legality, options for using free icons for commercial software is a lot less, than say, a freeware/FOSS project. Look carefully at the licenses: Creative Commons is a fairly popular choice these days, but there are others. Usually attribution is required, which usually means acknowledging them in the "About" section or the "README" file.
Sources for Free Icons
Like I said, I know of a lot, but these are the ones that I feel you should look at first.
Well, I can't say how good the icons are without actually looking at your icons, but there are certain things to keep in mind, specifically the Windows Icon Design Guideline published by Microsoft.
There are far too many if you want a complete list, but these are the good ones
“Silk” is a smooth, free icon set, containing over 700 16-by-16 pixel icons in strokably-soft PNG format. Containing a large variety of icons, you're sure to find something that tickles your fancy. And all for a low low price of $0.00. You can't say fairer than that.
There are also the lesser-known Silk Companion 1 and Silk Companion II, icon sets from other designers in the same style as (and often based on) Silk.
I've found the GlyFX icon sets to be really well made, and worth their money. They provide a great range of icons, both in the Windows XP and now in the Vista style.
They also have a product called "Iconbox" which is basically custom-made icons for other customers that didn't insist on them being exclusive - so they sell these off to interested developers, too.
GlyFX also does custom work, if you really need something done e.g. for a commercial or semi-commercial product, at quite reasonable rate (last time I checked, anyway).
I held an icon design contest with a $400 usd award, for a new icon for my program. It required a lot of sketching and feedback on every entry and there was little time for anything else. There was no awards to second places and I think it really affected how much effort people would spend on it.
Make sure you have plenty of time available for this. Make sure there is awards to 1st, 2nd, 3rd place.
In retrospect.. there must be another way to get a good icon made.
I'm found the Yusuke Kamiyamane's Fugue and Diagona icon sets useful. The Fugue set has 3000 icons, and Diagona 400. Fugue offers a variety of concepts, with variants of some.
I like the perfect icon icon suites. These are paid icons, but are pretty cheap and are high quality. They will also design custom icons for you for around $15. http://www.perfecticon.com/
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首先，免责声明 - 我不是应用程序开发人员，而是（业余爱好者，从技术上讲，因为我没有为此获得报酬）网页设计师/开发人员。 我在我的项目中使用了很多图标，但是由于我的预算为 0.00 美元，所以我从互联网上获得了相当多的图标集，所以我觉得我应该有一些发言权在这个问题上。
自动生成图标
自动生成的图标对我来说是一个很大的禁忌。 除非您的应用程序是分形生成器，否则生成的图标通常不适合该应用程序。 您最好坚持使用简单的
或 
如果您正在使用它。
免费图标
如果您不需要太花哨的东西，免费图标非常好。 你没有提到这些项目是否具有商业性质，因为合法性是决定你可以使用什么的一个重要因素。 另请记住，在 Vista/Windows 7 中，图标可以大到 256x256 - 该大小的图标通常不适用于免费图标。
就合法性而言，商业软件使用免费图标的选项比免费软件/FOSS 项目要少得多。 仔细查看许可证： 知识共享
是当今相当流行的选择，但还有其他选择。 通常需要归属，这通常意味着在“关于”部分或“自述”文件中确认它们。
免费图标的来源
就像我说的，我知道很多，但我觉得你应该首先看看这些。
设计你自己的
好吧，如果不实际查看你的图标，我无法说这些图标有多好，但有一些需要记住的事情，特别是由微软。
如果你想要一个完整的列表，那就太多了，但这些都是不错的
First off, a disclaimer - I'm not an application developer, but a (amateur, technically speaking, since I'm not getting paid for this) web designer/developer. I use a lot of icons in my projects, but since I'm on a budget of $0.00, I have a fairly large collection of icons obtained from the internet, so I feel that I should have some say on this matter.
Automatically Generating your Icons
Automatically generated icons are a big no-no for me. Unless your application is a fractal generator, the generated icons usually won't fit the application. You're better off sticking to the plain
or 
if you're using this.
Free Icons
Free icons are pretty good if you don't need anything too fancy. You didn't mention anything about whether the projects are commercial in nature, because legality is a big factor in determining what you can use. Also remember that in Vista/Windows 7 icons can go as big as 256x256 - icons of that size are not usually available for free icons.
In terms of legality, options for using free icons for commercial software is a lot less, than say, a freeware/FOSS project. Look carefully at the licenses: Creative Commons
is a fairly popular choice these days, but there are others. Usually attribution is required, which usually means acknowledging them in the "About" section or the "README" file.
Sources for Free Icons
Like I said, I know of a lot, but these are the ones that I feel you should look at first.
Designing your own
Well, I can't say how good the icons are without actually looking at your icons, but there are certain things to keep in mind, specifically the Windows Icon Design Guideline published by Microsoft.
There are far too many if you want a complete list, but these are the good ones
丝绸图标是免费的：
还有鲜为人知的 Silk Companion 1 和 Silk Companion II，来自其他设计师的图标集与 Silk 相同的风格（并且通常基于）。
The silk icons are free:
There are also the lesser-known Silk Companion 1 and Silk Companion II, icon sets from other designers in the same style as (and often based on) Silk.
我发现 GlyFX 图标集 制作精良，物有所值。 它们提供了大量的图标，包括 Windows XP 和现在的 Vista 风格。
他们还有一款名为“Iconbox”的产品，该产品基本上是为其他客户定制的图标，这些客户并不坚持要求它们是独家的 - 因此他们也将这些产品出售给感兴趣的开发人员。
如果您确实需要以相当合理的价格完成一些工作，例如商业或半商业产品，GlyFX 还可以进行定制工作（无论如何，我上次检查过）。
强烈推荐。
马克
I've found the GlyFX icon sets to be really well made, and worth their money. They provide a great range of icons, both in the Windows XP and now in the Vista style.
They also have a product called "Iconbox" which is basically custom-made icons for other customers that didn't insist on them being exclusive - so they sell these off to interested developers, too.
GlyFX also does custom work, if you really need something done e.g. for a commercial or semi-commercial product, at quite reasonable rate (last time I checked, anyway).
Highly recommended.
Marc
lgpl 图标用于商业，gpl 似乎适用于其他一切。
头像图标是一个很酷的主意。 我想你只需要将它们转换为 ico 即可。
通常我只是采用开发库中已有的东西。 否则有大量的桌面图标可供选择。
lgpl icons for use in commercial, gpl seems to work for everything else.
The gravatar icon is a cool idea. I guess you'd just have to convert them over to ico's.
Typically I just take something that's already in the development library. Otherwise there's tons of desktop icons out there to choose from.
我举办了一个图标设计竞赛，并为 我的程序。 每个条目都需要大量的草图和反馈，几乎没有时间做其他事情。 第二名没有奖项，我认为这确实影响了人们为此付出的努力。
确保您有足够的时间来做这件事。 确保一等奖、二等奖、三等奖。
回想起来......必须有另一种方法来制作一个好的图标。
I held an icon design contest with a $400 usd award, for a new icon for my program. It required a lot of sketching and feedback on every entry and there was little time for anything else. There was no awards to second places and I think it really affected how much effort people would spend on it.
Make sure you have plenty of time available for this. Make sure there is awards to 1st, 2nd, 3rd place.
In retrospect.. there must be another way to get a good icon made.
我找到了Yusuke Kamiyamane的赋格和Diagona 图标集很有用。 Fugue 集有 3000 个图标，Diagona 400 个。Fugue 提供了多种概念，其中有些概念有变体。
您可能还会发现上一个问题很有用。
I'm found the Yusuke Kamiyamane's Fugue and Diagona icon sets useful. The Fugue set has 3000 icons, and Diagona 400. Fugue offers a variety of concepts, with variants of some.
You may also find this previous question useful.
我喜欢完美图标图标套件。 这些是付费图标，但价格相当便宜，而且质量很高。 他们还将为您设计定制图标，费用约为 15 美元。
http://www.perfecticon.com/
I like the perfect icon icon suites. These are paid icons, but are pretty cheap and are high quality. They will also design custom icons for you for around $15.
http://www.perfecticon.com/