What to do? What to do?

Alright so I like to code a little. I'm not very good though. I like lisp, code as data is a cool idea. I want to practice my coding skills by working on a problem that needs solving. Where can I find one of these?

Download some GNU/Linux distribution and use it for a couple of weeks. Make note of the deficiencies that you encounter. Have fun fixing them. Otherwise, find some free game and tinker around with the code.