Personally, I love the idea.

I've been considering the same thing. Here's a link to a place I may use if I go with it.

BLOWOUT SPECIAL!!!! GOTHIC ANTIQUE 4" X 8" SUBWAY TILES - HUGE DISCOUN – Antique · More Info

Big Sale!!! 6" x 12" Gothic Antique Mirror Glass Harlequins - 72 Hour – Antique · More Info

If you decide to use, I think a beige/bronze may be more complimentary than white and easier to work with then green. Grey could be nice as well.

Bronze is interesting, how do you get a bronze mirror, is backing not silver? The granite has a lot of gray and green but also brown; the cabinets are black walnut so something to blend them together.

Its the same as cleaning a mirror, which in my opinion is better than stainless and better than tile because there are no grout lines. I like the clean look, but still have no idea on pricing.

If you Google, you may find a company and request a quote based on the square footage. I found the company below, but I'm sure there are lots of others and at least you would get an idea on pricing. http://www.syracuseglass.com/E-DOCS/Architectural%20Glass/EDOCS/Acid%20Etched%20Glass%20Specifications.pdf