An empty wall or windowsill can serve as a blank canvas for painted stencil designs that are guaranteed to add interest to a room. Stenciling can be applied to any room in the house, and can be placed around entryways, in empty corners, on a focus wall or down a hallway. Plus, walls decorated with stencils can take on a wallpapered appearance -- but without the fuss of wallpaper installation. For a particularly unique design approach, create a faux stenciled headboard in your bedroom.
Prepare the walls and windowsills for painting, removing any cracks or nail holes by filling them with spackle. Let the spackle dry for one hour and sand the areas smooth with sandpaper. Remove all sandpaper residue with a tack cloth. Paint the wall and windowsill with interior acrylic paint, using a paint roller and paintbrush. Let the paint dry for one hour.
Position the stencils in the desired area on the walls or windowsills, and tape them in place using masking tape.
Place a small amount of contrasting-color acrylic paint on a white paper plate. Dip a stencil brush in the paint. Wipe excess paint on a clean area of the plate. Use a pouncing method of pushing the paint into the open stencil designs. Let the paint dry for 20 minutes. Move the stencils, tape them in place in a new area and continue adding paint to the open stencil design.