Finito! I ended up with my own concoction of green grout on the copper vase body, with black for the background. I strongly considered the sable, but opted for green at the last minute. The blue vase was grouted with a modified ocean blue grout, and then I did a dark blue wash over the tempered glass area. I made these for a specific project - I have been asked to submit photos for a "luxury magazine" (her words), for an article on mosaics in the home. We'll see.