I've always liked the idea of an open source city builder game.
So to that end I've been making pixel art for it. Loosely called "Pixel City". It's inspired by one of the most glorious games of all time, SimCity 2000. If you haven't played it I suggest you give it a go sometime. Here's a few buildings I've drawn that fit the bill of most municipalities needs, and a few extra randoms as usual.
If you have any creative ideas to add, please do tell.