Elf house on a tree! That would be cute in the garden, especially in the tree over grown with ivy. How about some battery tea lights in the windows during outdoor parties. I hear the fairies/elves whispering "home school project" in my ear.
DIY: How to make a cloud! Wish I had know this when Nadja asked for a cloud for Xmas, we only came up with a dry ice version. She still has a jar of "condensed" cloud though. The cloud can be suspended from ceiling with light behind
This door way bean bag game uses the whole arm to throw the bean bag. It also requires focusing on one spot and aiming. I would use this in a class room because it is a simple and inexpensive game to get the kids active with gross motor skills and active.