Still Playing School: Fine Motor Rainbow Ball Game - I have one of these at home. Not only working on fine motor skills but great busy activity!
Toddler threading activity with giant cardboard beads. Could be a little project to have them paint the tubes, let them dry, and cut the tubes into smaller lengths (with some help). Add stickers for decoration and even more fine motor practice!
Cotton Ball Painting - Including the munchkins in making paint would add to the fun! An economical and entertaining fine motor experience.