What I play: Tau
So far my only army is Tau Empire, for 40k. I've got a fairly broad selection of units that's growing all the time, mostly useful at 1500 and below, though I could field 2000 if I had to.
I'm trying to paint the Tau in a typical T'au sept scheme (I spend a lot of time painting Vomit Brown armor...), with some more colorful alien auxiliary units. My favorite units are battlesuits, but of course I take a fair amount of Fire Warriors and skimmers, and sometimes some aliens or drones.
I've got some pictures up in the Dakka gallery. The painting looks a lot cleaner in real life where you can't zoom in all the way...
This site has some other pictures.