Here are a few links for some similar stone colors. I would guess it's Vintage from Materials Marketing, or the other colors from Ann Sacks - it's definitely a 2x4.
BACKSPLASH!The cabinet paint is standard Navajo White and the 3"x6" glass tile is from Tile Showcase (http://www.tileshowcase.com). I can't find the name, but the item number is PRA-PF36XX, Color C609.