I love the idea of wallpaper that invites you to color or otherwise customize it (again, returning to my functional walls obsession). Here are two favorites: On the left, from Fly, is an exhibition by happypets. The artists provide the line sketches and markers/crayons, and the viewers provide the color. On the right is actual, purchasable wallpaper ($40/double roll), from Graham & Brown (via Anh-minh, who always has cool finds). Designed by Taylor & Wood, “Frames” features whimsically drawn picture frames that you can fill with mini-paintings, photos, collages, 3-D collections (keys, shells, butterflies)–you name it.