are you using it to hang out or as a bedroom?
for a hang out, here are some ideas

- black walls (dark)
- red curtain if it's an option?
- cheap disco ball (maybe check party city or someplace like that)
- you can get rugs with square patterns to imitate the dance floor!
- squiggly lamps for a light source, also it's a cool vibe. theyre like 20 bucks at target.
- maybe a black futon.
- you can get those doorway beads (like at claires or something) that you hang on the top of your doorframe (they're like bead curtains) and line a wall or part of a wall with some, to reflect light and to add some girlyness, I'm sure there are some that aren't too elementary-school-style if you know what i mean.
- if you get to paint the walls, try getting some cheap glitter (29 cents a bottle at micheals) and pour some in your hand, then gently blow it onto the wet paint

- cool, funky, comfy furniture! think of mushroom chairs and director's chairs.
- I'm not sure how much a projector costs, but it can mimic a huge flat screen tv if shined on the wall, and you and your friends can watch movies and things on it.
- radio/iPod speakers!!
If it's going to be your bedroom then you can do all that but just add a bed! hope I helped, it was fun
