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.
Make your own snow paint at home with the kids. Such a fun winter activity for toddlers and preschoolers that you can do inside when it's wet and cold. An easy paint recipe you can adapt for all sorts of snow and winter creations.