OK a bit messy, but lots of fun! Make your own edible finger paint for the kids. Its cheap to make and safe to use and if theres any left over, store it in the fridge or freezer to use for another day.
Have a go at making your own fizzing paints using baking soda and vinegar. The exploding fizzy eruptions are great fun and bring your kids' paintings to life. Its a messy play activity and science experiment all in one.