Have a go at making your own Magic Rainbow Milk. Kids of all ages will love it! Magic Rainbow Milk is cheap, quick and easy to set up and if you do it outside (highly recommended!), theres not too much mess to clean up afterwards.
A tried and tested classic! Painting with potato stamps is lots of fun and cheap and easy to do at home. Toddlers and preschoolers will love getting their hands messy and creating some great pieces of art.