Our friendly neighbor actually showed us this one! Did you know what happens if you soak regular sidewalk chalk in water? (Say for 5 minutes or so.) After that, the chalk is almost like oil painting — making a design that is much brighter and lasts longer!
Look around Pinterest and you’ll see lots of people do this with old chalk pieces, or, make a chalk “paint” by making the chalk into a powder first before mixing with water. You can even use it to paint a tree!