The honest answer about blue wallpaper in a dark room is that it works, but only if you put it on the wall the daylight reaches last. We tried it the other way round first, and the room looked like a basement. The room was a 12 by 14 foot living room facing north, one window on the long wall, flat gray paint everywhere. The gray read cold all day and dead by four in the afternoon. The owners had already repainted twice, each time a little warmer, and each time the room looked the same.
What the room was doing wrong
Flat gray on four walls gave the eye nothing to land on. In a north-facing room the light arrives flat and even, with almost no shadow, so a single flat color has no texture to catch. The result is a room that looks unfinished at noon and gloomy by dusk.
The second problem was the chimney breast. It stuck out about nine inches from the back wall and was painted the same gray, so the one piece of architecture in the room disappeared.
The choice we argued about
The first instinct was to paper the long window wall, because it is the biggest. That was wrong. Papering the wall the window sits in means you look at it backlit all day, and any pattern turns into a silhouette.
We put the blue wallpaper on the chimney breast instead, the wall directly opposite the window. That wall gets the light last and holds it longest, so a mid-depth blue there reads as blue rather than as shadow.
The second argument was pattern against plain. A plain blue on a nine-inch-deep chimney breast would have looked like a paint job that went wrong at the edges. A pattern with visible movement in it gives the eye a reason to read the wall as a deliberate panel. We went with a dark blue marble design, where the veining does that work without turning into a busy repeat.
Measuring a wall that is not flat
A chimney breast is three surfaces, not one: the front face and two returns. People measure the front, order for the front, and then find they are four inches short on each side.
Measure the front face at its widest point, then each return from the front edge to the back wall, then add all three together. Measure the height in three places, because floors in older houses are rarely level, and use the tallest figure. Add two inches top and bottom for trimming.
On this wall the front came to 48 inches, the returns to nine inches each, so 66 inches of width for a wall that looked like four feet. That difference is what sinks most first attempts.
The two installation problems we hit
The outside corners of a chimney breast are the hard part. Paper does not like to turn a sharp 90-degree corner and stay put, because the adhesive has less contact right at the edge. The fix is to let the piece wrap the corner by about half an inch onto the return, press the edge with a seam roller, and let it set for a few minutes before you touch the next panel.
The second problem was a thermostat and a cable outlet, both on the front face. There is a correct order for working around hardware and it is not the order most people guess. We followed the method in this guide to cutting wallpaper around awkward objects, which is to hang the panel whole, find the obstacle by feel, then cut outward from the center rather than trying to cut the shape in advance.
What the room looks like now
The blue wall reads as the back of the room, which makes the space feel deeper than its 14 feet. The gray on the other three walls stopped looking cold once there was something warm-adjacent to compare it against, so nobody repainted. That was the surprise: the fix for the gray was not different gray.
The sideboard in front of the blue now looks like furniture rather than storage, because there is contrast behind it. Lamps matter more than before. Two table lamps at either end of the sideboard throw light across the pattern at an angle and bring the veining out at night. Overhead light flattens it, so the ceiling fixture mostly stays off.
If you want to see the effect without blue, the same logic holds for any mid-depth color on the opposite-to-window wall. purple wallpaper sits in the same tonal range and behaves the same way in low light.
What they would do differently
Two things. First, they would have ordered a sample and taped it to the chimney breast for three days before committing, because the blue looked noticeably different at 9am and 6pm. Second, they would have skipped the second coat of gray paint and gone straight to papering, which would have saved a weekend.
One more thing worth knowing before you start: most of what goes wrong on a first wall is preparation, not hanging. The usual culprits are listed in this rundown of mistakes people make when installing wallpaper, and the two that caught us were not letting filler dry fully and starting from the corner instead of from a plumb line.
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