you have what looks like or resembles a saltillo tile. if it's the real stuff, it can be refinished and stained.

if it's a look alike ceramic, then greens/tans/blues and yellows all work with it. and black and whites of course.

you haven't posted any other pics, or your shower or vanity or how big this is, so it's hard to say. But black hex tile on the shower floor looks good next to this tile.