Step 1: Enlarge clip art or a pattern from the room to the correct size on a photocopier. For supersize designs, have a copy shop print them for you.
Step 2: Trace the design onto a large sheet of template plastic, available in the quilting section of fabrics stores.
Step 3: Place the plastic over a cutting board and cut out the design with a crafts knife, leaving at least 1 inch of solid plastic around the motif.
Step 4: Lay fireplace screen flat on cardboard or a painter's tarp to catch paint that falls through the screen. Secure stencil to screen. Use foam brush and white latex paint to paint design on screen. Let dry. Repeat.
Editor's Tip: For best results, lay the pattern underneath the fireplace screen and try to freehand it using round foam brushes.