Studio Nommo in 2008, but since they recently released some great new designs we thought it was worth a revisit. With designs ranging from subdued and muted to loud and bright, there's bound to be something for almost everyone. Since 2007, Studio Nommo has been working with very talented illustrators and designers from around the world, to provide inspirational custom made, design-oriented wallpapers and wall stickers. In addition to their pattern collection, they also feature a wide selection of customizable wallpaper designs that are not only scalable to your wall size, but are also able to have color changes (3 samples are below).
If wallpaper is too large of a commitment, Studio Nommo also carries twenty different wall sticker designs. Shipping is now available worldwide, but if you have questions about buying custom wallpaper from a foreign source, Janel provided a great guide in Good Questions: Buying Custom Foreign Wallpaper?. (Found via decor8)