I'm actually pretty pleased with the result considering the limits that I had imposed upon myself. These are Core units, thus do not deserve too much attention. I limited myself to a maximum of one highlight, one shade, and 3 colors. I didn't want to spend too much time on them either so I gave myself a time budget of max 1 hour per model.
3:40 hours of work later (forgot to count assembly time), this is the result:

Not counting the time spent on the Corpse Cart, I'm quite satisfied with the 10 Ghouls since I spent only 22 minutes on each.