There is a new trend popping up on more and more home design, home improvement, and home fashion blogs: wall patterns. These bold paint effects are easy to do, they're far more reversible than wallpaper if you decide you don't like them, and they can dramatically change a room.
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Chevrons
Chevron patterns can be created narrow or wide, in brightly contrasting colors or more subtle ones, textured and plain, ornamented with lace effects and other touches or just straight up, no twist.
Stripes
Vertical stripes, horizontal stripes, big fat stripes, skinny stripes, all kinds of stripes, any kinds of stripes. If you're a little nervous about starting out with chevrons, stripes might be a way to ease into thing.
Squares, Triangles, and Other Tessellated Shapes
If it fits together in a pattern without overlapping or gapping, it's a tessellation. You could try an ombre effect with a tessellation that slowly fades as it climbs towards the ceiling, or you could use alternating colors, or you could play around with any number of other paint effects.
Stencils
Stencils provide a whole new world of wall patterns, as they allow you to create complex, detailed repeating patterns. Wall stencils are available from a number of interior design firms and you can also make your own -- maybe you're inspired by vintage wallpaper, something you see in nature, or a cool vintage advertisement that you want to enlarge and put on your wall.
Be bold: the great thing about paint is that if you don't like it, you can just paint over it!