Purple wall paper and duvet cover and.. well… what?? HELP, teenager in want of grown up room!!!!?

I am wanting to redecorate my room and have bought one roll of purple big swirly wall paper:

http://www.diy.com/diy/jsp/bq/nav/nav.jsp?isSearch=true&fh_search=miranda+plum&selected=products

which I am planning to put in the alcove I have with my chest of drawers and a mirror above it. I have a deep purple duvet cover with a bright pink bit at the bottom which I love and have been told Im not allowed to change. I now want to know what colour(s) to do my walls. I was thinking soft coffee:

http://www.diy.com/diy/jsp/bq/nav/nav.jsp?action=detail&fh_secondid=9240915&fh_view_size=6&fh_location=%2f%2fcatalog01%2fen_GB&fh_search=soft+coffee&fh_eds=%c3%9f&fh_refview=search&ts=1235311707667&isSearch=true

but now Im not sure if it is a bit dull and will look like polyfiller! I have quite a small room but am despirate for it to look grown up. Please help! Any ideas are welcome…
I was also wondering about a coffee bean brown??

Try using Sherwin Williams Color Visualizer to get an idea of what you like. Pick the bedroom that looks the most like yours. If you don’t like the coordinating colors, you can drag other colors to the boxes where it says Scene Colors.

http://www.sherwin.com/visualizer/