Applying acid stain to a concrete floor can add dramatic marbling and give a depth of color not available in any other type of floor. These step-by-step instructions show DIYers how to obtain great results.
Painted Concrete Floors - Actually, would do this for ceiling, with an inch hanging over the edges like a canopy. do a slightly lighter/matte version of the color in the room. Actually would look awesome over the edge of the mural