games or apps or themes

I'm using blackberry 8310. Oh, and is it possible to use games/apps/themes for other blackberry models on my own?

I'm really bored, and I can't spend that much money to buy games, so I want them to be free. I have a blackberry curve, 8530. Its from sprint and I have internet access. Also can you give me links to good websites? And list some good apps and games? Thanks :D