In a small bedroom the accent wall is almost always the headboard wall, and the color that makes the room feel bigger is usually the dark one. Here is why.
Self-adhesive floor tile does not fail because the adhesive is weak. It fails because water reached it from underneath, and that is a prep problem you can solve in an afternoon.
Nobody's peel-and-stick backsplash failed because of the tile. It failed because it went onto a wall with a satin sheen, a film of cooking grease, or a texture the adhesive could only touch at the high points.
Most blue bedrooms fail after dark. The shade that looked calm at noon turns purple or gray under warm bulbs, and nobody tested it before two coats went on.
The wall 6 inches from a gas burner and the wall behind the breakfast table are not the same wall, and buying one finish for both is how kitchens end up looking tired in two years.
Pressure-sensitive adhesive does not cure, it flows. That one fact explains why the tiles hold on smooth primed drywall and let go on a textured wall by August.
It holds up beautifully on a powder room floor and fails within a season behind a range or in a shower. The difference is heat, standing water, and surface prep.