Second, you can buy a different bedspread and sheets. Theres alot of them at Walmart, Kmart, Target, Bed Bath and Beyond, and Hot Topic. At Hot Topic, they have really cute bedspreads and if you wait a while, they go on sale.
Third, you can make a theme for your room such as:
-tropical/beach
-a color theme
-heart shaped stuff
-Animals
-Shapes and Designs
-Stars/Moon -they even have glow in the dark stars that you can hang on your ceiling like I have on mine.
I sugguest reading American Girl and/or Seventeen Magazine because they always have great decorating tips.Also Heres Some great websites that might be able to help you:
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