The skeleton warriors make sense as a first choice for any Necromancer, what with the Paladins that might try to stop you. Then you see the Skeleton Summoners who help along with the recruitment efforts. After a while you get to Skeleton Guards, the Skeleton Workers, Skelton Blacksmiths, and eventually you get into surplus territory and start getting the Skeleton Librarians, Skeleton Gardeners and Skeleton Diplomats. That might take until Week 7+ though :P
Floaty Mage McSkellybones is probably my favorite, because he looks like he's having the time of his life shooting those flames out of his hands at the ground. Every other skelly also has a neat pose, and despite their common origins, each seems to have it's own personality and flair to them to keep them unique.
Make sure you keep posting your results if you keep going with this! Batches of 7-8 like this one would work great! :)