Using a roller, paint your desired surface a neutral color to create the background.
Mix a few drops of raw umber liquid acrylic paint into the base background paint to create a slightly darker color. Lightly sponge this color across the surface with a sea sponge to create texture. Allow to dry for at least one hour.
Make the brick stamp: Using a serrated kitchen knife, cut synthetic sponges to brick size, 7 1/2 by 2 1/4 inches. Arrange sponge "bricks" in desired brick pattern with 3/8-inch spaces between them. Glue sponges to plywood using craft glue.
Using a roller, paint the sponge stamp thoroughly with a brick-colored paint.
Place brick stamp on surface and press firmly. Repeat, lining up the pattern to the bricks you previously stamped. For best results, use a chalk-line tool to snap a level reference line before you begin.
Use a half "brick" sponge to fill in pattern at edges of surface.
Mix a few drops of raw umber liquid acrylic paint into the brick paint to create a slightly darker color. Mix this paint with glazing medium at a ratio of 1 to 1. Apply this mixture with a single "brick" sponge over bricks to create texture.