A flat wall can look custom-built with thin strips of wood and one can of paint. The 7 walls below all follow the same rule, and once you spot it, you’ll start seeing it everywhere.

7 Wall Molding Design Ideas With the Trim Painted to Match the Wall
Molding doesn’t have to be white to show up. On every wall here, the strips are painted the same color as the wall, so the pattern comes from shadow instead of contrast.
That works in rust, green, gray, black, teal, and navy, in rooms from a nursery to a TV wall. Here are 7 patterns to borrow, from a plain grid to sweeping curves.
Make a Bold Color Feel Planned

Three tall frames line the wall behind the bed, and every strip of molding is painted the same rust as the wall around it. With no white trim to outline the shapes, only shadow draws them, so the color feels rich instead of loud. Center the bed under the middle frame and the whole wall looks built around it.
Pattern Without the Busy Wallpaper

Want pattern on the wall without hanging wallpaper? Slim strips run across at different angles, painted the same muted green as the wall, so they read as shadow lines instead of decoration. Black crib slats and a black floor lamp keep the green from feeling too sweet for a baby room.
Soft Curves for Boxy Rooms

Straight panels are the usual move, so curved lines catch your eye right away. Thin arches sweep across the pale gray wall, and a few round gold-toned discs nestle into the curves, giving the eye somewhere to land. The rounded sofa picks up the same curves, so nothing in the room fights the wall.
Dark Walls That Don’t Look Flat

Thin strips set on a diagonal give a full black wall something to do, since each one catches light on one edge and throws shadow on the other. Without them, matte black can read flat. Picturing a dark wall behind a bed? These moody bedroom ideas show how to keep it warm.
The Easiest Pattern to Copy at Home

Every strip here is a straight cut, which makes a grid the easiest pattern to copy, and slate blue-green over all of it makes the squares look like one piece. Plan the squares so each switch and outlet lands inside one, not on a board. Want a deeper green instead? Paneled walls in dark green show how far the color can go.
A TV That Blends Into the Wall

A black TV on a plain wall looks like a hole in it, so this one gets thin vertical bars in different heights above and below the screen, a bit like sound waves. They’re painted the same deep teal as the wall, which makes the TV look built in instead of stuck on. The blue curtain pulls the same color across the room.
Why Navy Works in a Bright Bedroom

Navy sounds heavy until you see it next to a white plank ceiling and bright windows. The tall panels here are painted the same inky navy as the wall, so they add depth without adding lines of white. Pull the throw and one pillow from that same shade and the bed ties right back to the wall.