hi corinna313. what colors do you really like?

The granite has some blue hues, is that true? Also has orangish hues?

Eden Tile Mosaics (tile vendor) on houzz. they have two I think may work but hard to say. Consider how much baking and cooking you do, and that alone may dictate choice.

One is deep burgundy with hints of colors from your slab here. The other is an array of dark blues. I'd almost like to see you go with something sleek because the stone here is so beautiful. Whatever you decide, both materials should be sync visually. Best to take a small slab (if you have one) and go shopping. Remember, the lighting in the showroom is different than that of your home.

A reputable tile company may ask for a deposit to take expensive samples home, but you'll be better able to "see" for yourself if you love the look once you have them at your place, under your lights. If you plan to install under cabinet lights -- the combo will really be a showstopper....

I'd head in the direction suggested by "greenthumb2" -- those icy blues in your granite. If not a solid color, pick a glass tile that gives you some lighter/darker tones but not 'opaquish art glass' ... think the blue of ice in a glacier... not all one blue, but it POPS!

This is 4x12 "vapor" from modwalls.com....think it would look stunning.