The basic idea is to spray some shaving foam on the mat or floor, drip food colouring onto it then allow the little one to smear the colours into the foam with their fingers or, if like me your toddler hates getting stuff on his fingers, with a paint brush.
He picked up a plant pot the was lying around and I was very impressed by his creativity to press the pot into the foam and watch it squirt through the holes.
It was an entertaining activity for me as well as Boris, he had a go at smearing the colours round with the brush and was fascinated by scooping the foam up onto the brush and flicking it about. It was funny for me if he got even the tiniest bit of foam on his fingers because he insisted that it immediately be wiped off. He is so funny about having stuff on his hands. He was very disturbed when I sprayed a blob onto his hand!
This was a great fun activity,brilliant for sensory play and learning about the qualities of materials, but does need careful supervision, it was no trouble to clean up, I just hosed down the mat. You could do this in the bath too, but I am a bit paranoid about all the chemicals and not really wanting them on Boris' skin.
I think there are opportunities to develop this activity further with bowls and spoons and scooping and maybe squeezing it through different objects, also would be fun to make beards and hats and the like with it if you aren't paranoid about parabens and artificial fragrances like I am!!
Have you tried this activity or something similar? What are you doing with your toddler now the days are getting shorter and the weather less welcoming?