I made these bunny slippers a couple years ago for a cloth doll. They're glued on. But there's no reason they can't be made for a clay doll or made as removable slippers. Here's how I made this pair.
Materials:
White felt
Pink felt or fabric or paint
Small piece of white lightweight sheepskin fabric or something fuzzy
Pink embroidery floss
2 tiny black beads
Small piece of cardboard (cereal box will do)