Make colored sand art by stirring a chalk stick in a bowl of salt. it changes the color. Stir less for light color and more for dark richer color. (I used to do this with salt and food coloring. but the chalk stick idea is brilliant!
i do have lots of cork left over. DIY Cork Memo Board: Inexpensive cork transform into a contemporary office bulletin board. Candy-color pushpins organize invitations, hold business cards, and show off interesting ephemera. (Go to bhg for the how-to.