Advent of Code is this hella fun series of programming puzzles that gets put out every year (well for two years but you know what I mean) You can find it at http://www.adventofcode.com
I didn't get around to it last year but this year I am. I am going to do my programs in common lisp because why not (until I give up and use something "easier.")
Common Lisp especially in my untalented hands looks beautifully viscious.
I didn't see any admonishments about putting code online, but I need backups and I see others have put their code up. My code is mirthfully carefree common lisp so you should probably find someone else to cheat from.
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