I like all of the dungeon skins.

1. The Dreadhorn skin looks really good on Dark Elves. They have the ears and facial structure to make it work. You can make the females look like porcelain-goth dolls with the river braids hair style.
2. The Sable-Man beast skin looks good combined with the beast personality. Plus, the skin is really cool looking on an Orc. I wear it on my tiny Wood Elf tank who I made bald w/horns. She looks like a little creepy imp
3. The Necromancer and Hist skin are pretty nice looking in general.

Best skin of all time. Especially at night :P