Being stuck inside for most of the month we were looking for new craft ideas and found this one for puff paint. I didn't have self rising flour so just threw maybe 1/8 teaspoon of baking powder into 1 tablespoon of flour and 1 tablespoon of salt. Stir it up, throw in some food colouring and mix with enough water to make it into a paste similar to thick yogurt. We used cotton swabs to 'paint' with, though it was more of a dabbing technique that worked the best. Make sure you use heavy paper ~ we had some matt board scraps around and used those. When you are finished put it in the microwave for 20-30 seconds. Viola!
If we ever get sunshine we'll try it again and see if leaving them to 'bake in the sun' has the same effect.