Fidelitywall
HD Walls
Rollout Wallcoverings
Some lovely murals that would work subtly - I really love skygazing, which emulates shadows from foliage on walls.
Officinarkitettura®
Luxe Surfaces
Merenda Wallpaper
Styl'Editions
Ornami
LBI Boyd Design Resource
Novacolor
Architects Paper
Mitchell Black Wallpaper & Textiles Chicago
National Solutions
Calico Wallpaper
NewWall Inc.
Backdrop Paint
Abnormals Anonymous
Photowall
Wallmur
Wallpaper Direct Canada
HappyWall
Spaghetti Wall
Astek
Cole & Son
Coordonné
James Dunlop Textiles
Maya Romanoff
Wallquest
Wolf-Gordon
House of Hackney