Am trying to decorate my study (it's a spare bedroom that I have co-opted for this purpose). Generally I like wallpaper and find it more interesting to look at than simply a painted room. Apparently green is a good colour for calm. However, I quite like warmer colours like reds and browns but it is a smallish room and might feel overpowering if too dark?
Have you wallpapered a room and particularly like how it looks? If so, would you mind taking a photo for me and posting it to your profile so I can take a ganders at it? 
Also, I might post a couple of links to wallpapers I have looked at and perhaps you might give me your opinion?