Wonder if I could do this with my door and inset tiles/pebbles into the panels. I guess you could but you'd have to make darned sure you used a good strong glue. I'd like to try this technique on a wooden bench ;
Bottle cap mosaic on an electrician's spool table. Caulked the grooves between the boards, then paint the table with exterior enamel paint. Caulk the caps to the top of the table. Then screw landscape edging around the side.