Tile sugesstions to match stone veneer

I haven't, but since it is a mixture of many colors I would pick something that contrasts with it. A vivid blue of some kind would be stereotypically pool-ish. Perhaps something with a mixture of blue and tan-gray (like the dominant gray in the stone).

The best thing to do by far would be to bring a sample of the stone to a tile store, and see what you like.
 
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