Surf the net for your design....I have uploaded some designs which I googled. Pick the one you want and try to recreate it with cardboard. I have picked a design from ebay....you may choose that or what you prefer :-) My choice is the last picture.
Renaissance Medallion 18" X 18" Bronze-Highlight Polish, light travertine & noche stone Mosaics can be customized to meet your specified size requirement. Available in any metal / any finish / any stone www.landmarkmetaltile.com #metaltile #LandmarkMetalcoat