Female Teen Bedroom Help

Not sure about just one more color -- you might want to do a variety of colors. My daughter's room has red, orange, yellow, dark pink, light pink, and green, which sounds like a cacaphony but works quite well.

I definitely think the walls (if that's what you're referring to) should be a tamer color -- light yellow or light pink, say -- and then pull in various other colors with prints.

Hmm when clothes are those colors, they tend to be in a plaid pattern, so yeah, a tamer color is woven in, like a tan or straw color. Since you already have two really vibrant colors going, another eye-popping color might be a bit much. This is kinda what I'm talking about: http://www.craftpizazz.com/products/20021

Lots of florals in those colors -- flowers plus leaves/stems.

I'm thinking curtains, rugs, prints (like posters or whatever), colorful frames. Doesn't have to be chintzy flowers, at all. Do you live near an Ikea? Lots of cheap, interesting options there. But even Target has good stuff lately, I personally like a lot of the Swell stuff (Cynthia Rowley + pal.)

If the pink and green are vivid I would go for a more subtle variant for the walls, maybe a pastel pink with green leaf stencil patterns in appropriate places.

Color for walls . . . if not too late
I just decorated my niece's room. She really like the lime green colors . . and hot pink was usually an accent color. Both very bold. So, I complimented with a lavender! It works great and looks great. Especially when I painted the focal wall lime green and the other three walls lavender. It made all the bold colors "pop" without having too much going on with the walls. Sounds like this concept couldn't have worked in your room, also.

Oops.
I meant COULD HAVE worked in your room, also.

I usually go to my local paint store and get a lot of swatches…they're free.

Here's a site that may help you with your color ideas.

http://www.behr.com/behrx/workbook/