Kids do not generally do subtle. They do bright and joyful. When choosing colors keep them bright (and consider mixing brights and pastels). You don't immediately notice a color scheme in this room, but it's there.
When you use a lot of color in the decor, much of the kids' "messes," like toys and books, blend into the overall patchwork of the room. Rather than being distracting, they are part of the big picture.
Embrace visual chaos with multiple colors, patterns and textures. If you go with it, you can achieve a lovely and exuberant balance even when there's no obvious focal point.
This room is modern and lovely, but it also has places for kids' stuff — bins, shelves and large under-the-bed drawers.
This borders on aspirational dream room with that built-in loft and design-minded wallpaper. But it makes room for a real child with all that storage and color and clever use of space.
This is another borderline room. To have a room like this assumes that no one ever gave your child a giant, ugly plastic toy and that somehow you've managed to convince the kids to collect only neutral-colored objects and paint in only pretty pastels. But I like it because it shows how a cohesive color scheme can help make a room look "done" even when it's messy.
The room that Ikea built. Whatever your opinion of the Swedish giant, you can't beat it for colorful, playful children's design. The items might not last forever, but neither does childhood.
White or neutral walls are a good balance for the jumble of color and textures in most children's rooms. Notice that the leaf-green accent color helps bring together all the other colors present here.
Well designed and nicely symmetrical but not too perfect. And the bins. There is nothing more useful in a kids' room than bins. Nothing.