Turn a closet door — or the entire kitchen wall — into a message board with a few coats of Krylon Chalkboard Paint ($5 to $7, www.krylon.com for store locations). The spray paint is available in black or green and works on most surfaces, including wood, metal, glass, plaster, and plastic. You’ll need to apply an aerosol primer before spraying the surface with the chalkboard paint; use three to four coats of the paint for the best coverage.