So after a few hours of dabbling with green stuff and sculpting, I finally have the 8 master bases done. After I cranked out the first 3, I started getting quicker with them, trying to make each unique.
I experimented with a couple, trying to add different textures. I'm hoping that each of them will look similar, yet different at the same time. I think when I start casting them, then painting them, the drybrushing will pick out the unique textures. I'm going to let the green stuff set over night and cast the mold tomorrow. I haven't cast anything for awhile, so I'm really looking forward into seeing how they turn out.