I have to say Agama. I know that everyone else probably made this choice, and I do agree that she doesn't make many tilesets. Still, the ones he did make are so good, they deserve mention. I also really like Disguise. It is hard to choose beetween them. Violet has also made some good stuff, though he wasn't on there. I also liked War Torn, but one tileset isn't really enough to deserve nomination. Mez's tilesets are too overused and not that amazing in the first place. Dethman doesn't make tilesets anymore, but in his day he was quite good, though I'm still having problems forgiving him for the level 7th Lava Fall. Mirrow makes some entertaining and fun-to-use tilesets, but I can't say he makes so many high-quality tilesets like some of the others here. Overlord's are spiffy-looking but a little low on eyecandy. Newspaz is good, but not as good as some of the others here. Skulg's tilesets are all good but too small. I haven't seen much from Jaws, but what I've seen so far is good but not amazing.

I think I will vote Disguise, with Agama as my second choice.

(Gender correction edit. -Traft)