Cool whip food coloring = Infant play paint.
Empty box + Crayons = quiet activity for your two year old.
The Stay-at-Home-Mom Survival Guide: Toddler Activities - peeling tape off the table (or fridge) develops fine motor skills (lots of ideas here)
10 best baby playtime activities found on pinterest...why didn't I think of this???
Paint in a baggie and taped to a window. Kid mesmerizer!