What color to paint a college guys room?

[theredmission]

Well I just moved back home after completing my undergrad and will be living it up w/ 'rents for a little bit while I work on my MBA. After coming back I realized my room is really dark and needs some fresh paint, but can not for the life of me figure out what color would match my existing furniture and carpet (both pictured in below link). I was thinking something light on 3 of the walls and the the 4 another color but idk. As long as its somewhat 'manly' and fits my outdoor maniac lifestyle itll work w/ me). Also to note I have a lot of black and silver stuff that I had at my apartment during college so it prob would be good if it matches that too.

http://i167.photobucket.com/albums/u131/keksmattson/DSCF5960.jpg
Note: right now its dark green at bottom and a light brown on top (you can kind of see it in the pic)