My daughter made a mural for my son and his wife when they were expecting their first baby. She rented an overhead projector (it wasn't very much) and then just used a picture from a colouring book. She projected it on the wall, then traced over the lines, then painted it all in afterwards.
The result was gorgeous - it's a group scene with Pooh and Piglet and friends all dressed for bed. Very cute. And then she added Tigger bouncing on the closet door.
Teresa