This would be a fun idea for kids and a great use for all those toilet paper rolls I can't throw away! Chopsticks or tweezers for fine motor skills, used to pick up and drop pom-poms into color matched toilet paper rolls.
Magic Milk Paint idea from Modern Parents Messy Kids. This is another one of those awesome 'science meets art' activities for children, and you only need milk, dishwash and food colouring to do it. Looks fun :)
Dry erase on plastic plates, hmm. From previous pinner: Perfect for math in focus number decomposition! Use a plastic plate and you can write with dry erase! Great to teach part part whole, fact families, etc.