I'm a big fan of some of the Skaven models. The crew of the war engines, the lords, even the Stormvermin. being humanoid mutants, they fit the role of degenerate humans and they share a similar flavour with their dirty, experimental technology.
Warlord Spinetail arrived today, so I put the putty and scalpel to work. He's made up of all sorts of bits from all sorts of ranges and the claw is from an AT-43 model! See if you can guess them all.
In other news, while I quietly shake my head at the unoriginality of Mantic's races, I am very happy to see their 'Space Skaven' previews. They, as you can guess, will make great Dark Mechanicum models once I get my hands on them! Kudos, Mantic.