If you're in this for the long haul, like through high school and maybe even college, try a theme that is not just a fad, like "My Kitty" or "Strawberry Shortcake". HOWEVER if you DO like either of those, pick a more mature grand scheme. EG: Like the new Strawberry Shortcake? Use a light green (sage w/ a tiny bit of yellow in in, but not lime) on the walls and then a slightly dark berry type red for any trim, or a couple of items of furniture. Then you could use some 'flower' type things and 'strawberry' type things for the most of your 'knick knacks' and bedding / window treatment, and throw in a few of the catchy Strawberry Shortcake items. As you get older, you can keep the color scheme, and maybe add some same green and berry plaid for the bedding / window treatment, with a green / berry flowery bed skirt and valance, and remove the Strawberry Shortcake items. As you get older, you might want to darken the berry items to almost burgundy - easily done w/ out stripping any wood/paint, and change the green in the walls to a more sage color, also easily done. Be sure to add for pop a big silk HOT PINK and LIME GREEN pillow.