BM Venetian Marble

I would do a muted blue/gray or a muted turquoise. It will pull it away from bland without being too out there. Here are four different color ideas.

thank you sooo much for the images!!!!! and thanks everyone for your suggestions! they're all great. learning towards the muted purple/ blue-gray

I would also might look into changing out the vanity top, as no matter what color you have it will stick out, unless you add more brown into the room. I think the purple is the way to go.

Might also want to look at BM Caponata "Infused with purple undertones, this rich dark chocolate creates a lush atmosphere"

The bathroom looks to be in very good shape. You could stay neutral, and add color with accessories, too. I just put this rug in one of mine and love the color it adds.

SW Creamy and a colorful rug.

Or SW Seasalt, BM Aloe or Quiet Moments.