Stripes
Stripes are always popular, and not just with kids. You can find a striped fabric or wallpaper in just about any colors you like, or paint a scheme on walls yourself. Keep in mind that horizontal stripes tend to make walls look wider: For a room that resembles a bowling alley, visually widen the narrow end walls with horizontal stripes. Use vertical stripes to visually raise the typical eight-foot ceiling. Don't have too much contrast; yellow and black stripes, for instance, will tend to visually "vibrate" in a stressful way.
Plaid
Plaid is another timeless favorite that looks handsome in jewel tones (ruby, emerald, sapphire, etc.). It can also look pretty but sporty in hot pastel tints. Plaid's squared-off shapes give it a tailored look, but the blending of color tones can add warmth and interest to any decor. Plaid's simpler cousin, checks, shares a lot of the same charm. Color makes all the difference: Imagine pretty pink-and-white gingham checks in a countrified nursery or no-nonsense navy-and-ivory checks in a collegiate room.
Flower prints don't have the unisex versatility of geometric stripes, plaids, and checks, but in a girl's room, you can combine geometric patterns and freeform floral for prettiness with punch.
Today, in the market, there are many types of wallpaper for kids’ room that feature a great array of sport, animal, fairy-tale, and cartoon motifs. In most cases, coordinating wallpapers and easy-care fabrics are also available. If you're not sure your child's current enthusiasm will last, paint the walls and use just the easily strippable wallpapers border from a popular set.