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.
There are lots of fun kids arts and crafts activities you can do with coloured pasta and its easy to make at home. You can sort it, thread it, mix it, use it for simple maths, add it to a sensory box and so much more. Non-brand dried pasta is also very cheap to buy and comes in all sorts of shapes and sizes.