Sensory Bag for Baby - Plain Vanilla Mom. Zip-top bag(s), hair gel, toys like rubber frogs and Silly Bandz, duct tape. (And supervision).
This actually made me think, why not wrap the tray in plastic wrap for play time, meals, whatever. The Stay-at-Home-Mom Survival Guide: ideas for learning activities from infants to early elementary.
Styrofoam pipe cleaner bead mazes to adress fine motor skills
Crossing the Midline with Fingerplays develop Crossing the Midline, self regulation, oral language, transitions, classroom management (Also see for Ram Sam Sam song)
Name Games for Preschool thumbnail
Pretend Play Vet's Office with Free Printable - Mess for Less
Limited shades of color: Easel Activities « Open-Ended Art For Young Children Pre k FA FA