We just put in Fantasy Macaubus counters. I would suggest you do not pick backsplash until yours is installed and you have painted your space. It looks so different in our house than it did in the warehouse. We repainted our kitchen (we did an entire remodel) and that also really changed the look of the slab.
Putting the same slab on the backsplash would have been pretty great, but wan't in the budget. I have ordered backsplash tiles that look hand made, and have some color variation so they are cream, grey-ish and beige-ish. All of the blue tile options we brought home looked too heavy. The tiles are backordered, however, so I have been looking around more. I feel like the ones I picked are very pale, I kind of think darker would be better. Its hard to pick the right color, my slab ranges from taupe to grey to blue. BTW, I was very concerned out my slab being busy - my husband loved the "river" of blue through it and wanted that area on the island. But I didn't want so much movement on the perimeter so we asked the fabricator to cut it so that the quieter areas were showcased, and we didn't really use any of the white, swirly areas except on the coffee bar. I WISH I hadn't done that - that is my favorite part now! I don't know why I was scared of it. My least favorite parts are the quiet parts.... So, just know that it will look far less busy than you think when it is flat as opposed to vertical in the warehouse.
IfI had it to do all over I think I might have kept this slab for the island and coffee bar and then gotten something dark grey, maybe brushed for the perimeter to add contrast.
And in case you are wondering, we've had it in for about 4 months and its been bullet proof! I was concerned at first and careful but now I drip stuff all over it and its really fine.
Here's what the slab looks like installed:
And these the tiles I am considering (it comes in both square and 3x9 rectangle, you can see both shapes on the sample board)
Q