Just finished these for the alter.I carved one side and mitered the corners then made a mold of it. Using the mold I poured 8 castings to form the two bases. I cut and routed 2 wooden tops with a trinity / omega design. I applied 3 coats of polyurethane so the next step would not bleed into the fibers of the wood. Next the grooves were filled with tile grout to pop the design then 2 more coats of polyurethane to deepen the rich dark color and waterproof the end product.