gray 3

Photo: Marili Forastieri, from Outside the Box

3 of 6
Find Your Middle Ground
Like beige, eggshell and taupe, gray has a reputation for being an "adult" color: It's mature and sophisticated—and it can be completely forgettable. Not so with this trompe l'oeil wallpaper. It's a shot of fun, yet the charcoal background keeps you from feeling as if you're plunked in a cartoon fishbowl.