Flat doesn't have to be flat any more.

Now this is a clever way to get rid of those boring WHITE walls! Below is a caption from 2modern.com

"Inhabit's Embossed Wall Flats are designed to expand in any direction. With peel-and-stick adhesive tabs and an automatic pattern repeat these wall tiles are simple, modern, versatile and goof-proof. You can cover a existing wall, help disguise a not-so-smooth wall or add a modern pattern to any room setting.

Customize them by rotating every other tile or row, mix-and-match patterns or paint them to coordinate with your decor. The rule is there are no rules and the important thing is to have fun with it. It's low stress, low commitment and a big payoff in the way these tiles will impact a space.

Only for use indoors. Sorry but they are made of paper. Wall Flats can be used to do an entire room, one wall or to create free-standing-art pieces.

Inhabit Wall Flats are made with 100% bamboo pulp. Bamboo is one of the worlds fastest self-replenishing resources. The process of molding the panels is chemical-free. Panels can be recycled."

http://www.2modern.com/designer?search=wall+flats

The braille wall is my favorite.