This summer I worked with the tango-artists team to create an icon set for gnome-games. At this point, the status of the icons is half-and-half: some of the icons are in gnome (if you're using 2.16, you'll see some of them), but some of the icons haven't made it in yet.
I've seen various versions of my icons floating around the web - particularly in lokheed's icon collection - but I've updated a lot of the icons since. I figured I'd do the world a favor and release them here.
So here you go - if you can't wait until whenever (if ever) my icons are included in the gnome-games package, or if you are using the older versions now, or if you are just curious, here's the final gnome-games tango icon package.
Screenshot courtesy of jimmac.