I've totally been in your shoes before, searching for that perfect wallpaper to jazz up my space. I can vouch for California Wallpaper; they have some amazing stuff! I actually used one of their for my home office, and it turned out fantastic! The designs are so unique and artsy, just what you're looking for. What I did was take measurements of my walls and browsed through their website to find a design that complemented my room's color scheme and furniture.