I'm not hosting this server, Undead_Sheep is, but it's awesome and he hasn't made a topic for it yet. There's sprite art, houses, giant cacti, a clock tower, a really tricky maze inside a giant tree, and some of my own constructions. I made connect four, chess, and mastermind before Sheep started suggesting things, and now there's also Battleship and Chinese Checkers. The server backs up routinely and has spacious spawn jail so even when there's no ops to let you in you can chat comfortably with the regulars.
I signed up to post this. The server is just that awesome.