Elizabeth and I spent a lovely afternoon painting rainbows on the dining room windows with a mixture of food colouring, corn starch and shampoo (yes, these are the same ingredients we use for our bath paints, although I used more corn starch for the windows!)
Daddy even helped at the end by helping Elizabeth put rainbow handprints "way up high". If I were doing this again I might have tried painting a sponge with rainbows and letting Elizabeth wipe rainbow patterns onto the window! Elizabeth painted a horse and people coming to her party under the rainbow.
Afterwards she had a painting bath to "clean up".
I would definitely do this again - the "paint" came off really easily. Auntie Karen and I gently scraped the paint off and vacuumed up the bits. Then I rinsed the soap residue off with water and wiped dry. Voila! Clean window, at least on the inside...