Early years mark making - Fireworks painting activity - great new year's or other celebrations activity.
Could also do addition and subtraction wheels - Free printable number wheel for number recognition, number matching games, subitising activities and games to learn number bonds to 10 or 20
Pressure involved to do each dot. Adaptations for medical play?
Love this idea - Padlock number challenge
My daughter loves super squishy jelly for a messy play time.