Open source icon for my application.

Does anybody here knows where can I get opensource icon theme for my application. Icons like save, open, folder, close. The icons should be a complete theme, I mean they should be the same design style. Also it would be nice if it also provides GUI skins like buttons and others. All I need are images, I'll do the programming stuff.

Advance thanks to you all.
Oh forgot to say, I already found tango project and hoping to find something else. I'll use tango if I don't have any choice. Anyway thanks for replying.
If you don't like Tango you can try Crystal: http://www.everaldo.com/crystal/
Unlike Tango ( which is public domain ) it's LGPL
And AFAIK doesn't provide scalable vector images.
Ok thanks for the help, I guess I'll stick with tango.
Here's a list of a few icon sets and their licenses:

http://en.wikipedia.org/wiki/Wikipedia:Icons
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