Create decorative edges for your shelf by routing three sides of an 8-by-18-inch board. Rout the two 8-inch edges and one 18-inch edge.
Go over the routed edges with fine-grit sandpaper until they are completely smooth.
Wipe the edges with a tack cloth to remove any sanding dust.
Brush a coat of wood finish on the board with a paintbrush. Allow the finish to dry for 72 hours before handling.
Attach two shelf brackets to the bottom of the board, 2 inches from each end. Attach the other ends of the brackets to the wall, in the spot where you want your decorative shelf to go.