Although repainting the walls is usually the easiest, most economical way to change the look of a room, that's not always true when much of a room is tiled.
If your child's bathroom tiles are in reasonably good shape, you can add color and pattern to them with stick-on accents or you can stencil small designs at random points using china paints.
Then, extend the look with more stenciled designs on the shower curtain, toothbrush holder, step stool, towels -- whatever suits your fancy.
If you don't want to get too carried away with repeating a pattern, look for a related pattern; for example, if you're using mostly flowers, throw in a butterfly here or there.
Repeat a color note in several spots around the room for a charming coordinated look that's fresh and easy.
The next step in designing a bathroom for kids is to make the fixtures themselves suitable for the little ones. See some examples on the next page.