I was a big fan of the "Buffy the Vampire Slayer" and "Angel" series (the earlier years) and the coolest part was that monsters were real and lived among us. So if zombies are real, monsters being real in a gaming/miniatures setting is not a great leap.
Shown left are some cool Trolls from Newbold (http://newboldworld.com/) scupted by Bob Olley. These guys are large, but that's how Trolls are supposed to be. Really nice figures with very little flash; the company sells miniatures for charity and they clean them up before they send them out. I recently bought some Space Trolls that I need to get painted up to.
Dwarves are done by Bob Olley (http://www.olleysarmies.co.uk/) and were really fun to paint. Check the site out if you're into dwarves.
I have a few other humanoids to paint and will hopefully add them soon.