How to Make Faux Stone on Sheetrock Walls

Cover a rectangular trowel with a 1/4-inch thick layer of wall plaster.

Press the plaster-covered trowel directly onto the wall firmly so that the plaster adheres to the wall's surface.

Slide the trowel downward evenly so that the edge of the trowel does not accidentally taper the plaster. You want the plaster to remain blocky and chunky on the wall.

Repeat to add on as many plaster blocks as you prefer, spacing each block by 1/4 inch.

Moisten a round sponge with water, then dab the sponge over the surface of each plaster block. This will cause the plaster blocks to become dimpled and more closely resemble real stone.

Allow the plaster stone blocks to dry for 12 hours.

Paint the spaces in between the blocks with dark gray latex paint. This will make the creases in between the stones appear to have more depth. Allow the paint to dry for four hours.

Paint the surface of each stone block using medium gray latex paint. Allow the paint to dry for four hours.

Coat a paintbrush with light gray latex paint, then tap the brush to make the bristles splay out. Tap the splayed out bristles lightly over the surface of each block, which will apply paint to the raised areas but not to the recessed areas. This will further enhance the plaster stones' appearance. Allow the paint to dry for four hours.