Textured wallpaper on the ceiling...this is an inexpensive way to get the look of tin ceiling tiles.
Paintable Textured Wallpaper
Getting a two-tone effect with paintable wallpaper: First paint on the color you want to stick out the most, painting the whole wall with it. Next, paint on the color that will be the most recessed, then wipe it off with a fairly stiff flat sponge. The effects you can get are endless.
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Paintable textured wallpaper I want to put this on my ceilings!