A glass backsplash is unlikely to look busy even with a busy granite. You can get larger tiles for fewer grout lines or consider back painted glass. Save inspiration photos from houzz to an ideabook if you haven't. Choose the element you love (tile or counter) and then neutralize the other.

I just looked at your idea book. It looks like you are drawn to mosaics. I would suggest a monochromatic mosaic for a more updated look (over the linear high contrast glass tiles). That will give you more of a textured than busy effect which could work with a more dramatic granite which you also seem to like.