Tiffany Stained Glass Tile Stacked Twilight with a mixture of black, white, and gray for the kitchen backsplash, bathroom, and shower walls. This mosaic is made of glass tiles that are stained in its liquid form and then baked in a kiln, creating randomly veins in different colors such as blue, brown, white, and grey. They are mesh mounted on a 12 inch by 12 inch sheet for an easy installation.