Thanks everyone. My original plan was to just put some modeling sand down, and a couple of small rocks (kitty litter), to the base up to the little ridge of the base. This is my first miniature, and my first ever plastic miniature, in a long time. I wanted to keep it simple.
But after mounting the Nurses, I noticed the detail of the high heels and the general small size of the feet. At this point, I just want the base to be flush. After looking around, I wish I would have gone for a stone floor look.
I think i'll try some of the options graciously given above and try to remove the canine remains model, and go from there. I'm getting anxious to paint,though. Messing with those stilettos makes me anxious.
To keep it simple, I would be happy a nice finished look, preferably a flush look, but I'm open.