Abstract on Wedi board

Here's a closeup:

Here's the full view, framed (click to enlarge):

This is what the wall hanging looks like from the back: 

This is the canvas, reverse side, with the Wedi installed and a skim coat of thinset applied.

Artist canvas turned over with a piece of Wedi inserted and siliconed into place

This is a 16"x20" artist's canvas, pre-stretched and "gallery wrapped."  The canvas is not stapled to the edges of the wooden stretchers, but nicely wrapped around and tucked in the back.  I measured the Wedi to fit into the cavity formed by the back of the canvas and inserted and installed with silicone around the edges.  Then I applied a thin coat of white thinset.  I applied the tesserae with MAC glue.  I used more of the wonderful hand-poured Vancouver stained glass, parts of terra cotta house numbers, Swarovski crystals, costume jewelry, glass beads, polished amethyst, shells, broken plate, the footer from the back of a plate, and beach glass from Hawaii.   I grouted with charcoal grout and then randomly painted the grout here and there with metallic acrylic paint.  Finally, I installed the piece in a picture frame, and installed eyes and wire near the edges of what was the front of the canvas but is now the back. 

I developed this method because I wanted to use the light weight Wedi board instead of a heavier substrate, because I worry about hanging something really heavy on a sheetrock wall, and with this method I don't have to worry about a specialized hanging system; I just install little eyes and wire as on any other picture.   (An added bonus is that the hanging looks so neat and finished from the back.)