I was looking at the spritelib competition and on the whole I think it is a good idea but there are a couple of problems. Firstly spritelib doesn''t have very many usefull frames of animation for games. You can make do on that count to a certain extent. A bit more of a problem is that there is no background art in spritelib. Which is a bit more of a problem. Some ideas that would be good would be to approach a few game companies and ask if they are willing to make public domain graphics that they are no longer using. Another possibility is to try a competition where everyone has to make one addition to a free graphics archive.