For the letter I, we learned some science:
(Note fancy science words are bold and italicized, please ooh and ahh)Rock salt + near boiling water
Stir to dissolve = Concentrated salt water. It goes on clear with a paint brush. Check back as water evaporates and salt crystallizes on the art work.
Perfect for all things icy and snowy, our favourites were igloos, icebergs, and a snow storm (paint splatters).
Tip - a wax crayon works great to draw the outlines as it repels the water.
The best part? the "paint" is easy to clean up and does not stain.