I haven't been playing RL games very long, nor am I very good at them,
but I've been spending quite a bit of time with Dungeon Crawl lately.
After getting a small group of people playing it one of my friends
(Alice Lee) took the time to compile an OS X version for the tileset.
I'm not too familiar with Mac's or OS X, so I'll let her site do the
explaining:
http://magical-girl.com/crawl/
-Shapermc