How to easily paint a mural for a nursery, bedroom, or playroom: 1) Trace the illustration to a transparency. 2) Use a clear, not frosted lightbulb and a cardboard box rolled into a square tube. Tape the transparency over one end and put the light into the other. Adjust the position of the tube to get the size you want. 3) Trace onto wall. 4) Paint inside your traced lines like a coloring book.