Wow, your backsplash looks remarkably similar to the one I did in my kitchen, also tumbled stone. As I was pasting up all those diamonds, I kept thinking "half square triangles, square-in-a-square..." So when it came to the focal point behind the range, I wanted to make something that looked like it could have been a quilt. I guess inspiration works both directions.
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Come to think of it, that would make a nice quilt...