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Choose colors that are classic and bright for a theme that will last your child into their teens and beyond. Teal, bright green, white, and red make a good color palette that works for any gender child and will still appeal to a teen. A dark blue room with hints of silver throughout is a great basis for a room. Space is a fun theme for a kid that will still be "cool" when they're 16, if you do it right. Get items like a moon lamp, bedding with stars, icicle lights around the top of the room, and other details that draw the room together. And under-the-water look will appeal to lots of kids and it's easy to help it grow up with them. Use colors like light and dark teal, seafoam, and a few hints of green. This room works particularly well if you have beige carpets already installed. A couple of stuffed fish friends and something like a jellyfish lamp can further draw the room together. Excite your child's sense of adventure by giving them a room that any explorer would love. Paint the room with the muted colors of maps (off-white, light green, beige, and maybe some hints of red), and decorate with globes, vintage suitcase storage, airplane mobiles, and train maps. Some greens and browns, with a few hints of blues can create the basis of a room that your child can enjoy for years to come. This is a great room for a kid that loves stuffed animals, as they'll fit right in! Get a unique look by creating a wall tree out of paper, and a circular blue rug makes a great "pond" at the center of the room. If your little girl longs to be a princess, avoid painting the whole room pink by going with a fairy tale castle theme instead. Grassy green on the lower part of the walls and sky blue on the upper parts will create the look of rolling hills, some tall gray bookshelves can be painted to look like towers, and a stuffed dragon in the corner can complete the look.

Summary:
Do bright, blocked colors. Do a space theme. Do an ocean theme. Do a travel theme. Do a nature theme. Do a fairytale theme.