For excellent examples of wallpaper why not look at the following?

Timorousbeasties.com

Noted for its surreal and provocative textiles and wallpapers, the design studio Timorous Beasties was founded in Glasgow in 1990. Timorous Beasties was shortlisted for the Designer of the Year prize in 2005.

Cole-and-son.com

Due to their distinguished printing history, Cole & Son has become the prime source for entirely authentic period and contemporary projects. Cole’s wallpapers can be found in a multitude of famous buildings from the Palace of Westminster to the Brighton Pavilion, from Buckingham Palace to the White House.

Grahambrown.com

Graham & Brown not only has it's own fantastic design studio developing fantastic products, but has also team up with numerous Designers of international stature to develop with them some beautiful products.

Interiors-europe.co.uk

Interiors Europe endeavours to make available the widest selection of wallcovering from cutting edge designs to traditional styles, with many of these ranges being previously unavailable to the public.