As soon as I clicked on the grout color link and saw it led to Jablon, I wondered if you were using the "Jill mix". I'd recommend staying with a lighter grout. The delorean, what a huge mistake. I understand your angst now. I'd go as "white" as standard white grout, stepping down just a tad in grayness to the pearl if you want to avoid the white. The Silverado they recommend is on the dark edge for me. That's as dark as I'd go. My hokey analysis? With that tile I wouldn't want a grout that's darker than the tile. I'd go similar to slightly lighter, and I'd actually lean towards lighter. A darker grout will come to the visual forefront and break the wall into a grid, emphasizing the gazillion individual tiles. A similar to slightly lighter grout will sort of disappear into the background and let the tiles be the focal point, and allow the tiles to blend with one another across the wall. Just my opinion, and that's what this is about...how you personally perceive color, shade, and pattern. Your eye may be different than mine, your end goal may be different than what I'm picturing in my head. But the delorean gray? Ouch!

White. Don't make it more busy than it is.

Do you have pictures you can show of the pavers?

Sorry, new here and don’t know how to edit post. Paint chip for vanity is sitting on the counter top. From light to dark: warm grey, cobblestone, silver.