3" is too big. We replicated this look, and 2" is perfect. We bought them at http://www.thebuilderdepot.com/cacbiho2hemo.html

Here's our final look.

You purchased the Bianco Carrara, not the Venato Carrara? Just checking. Love the floor tiles -- would like to replicate that myself.

Adam, would you mind sharing what vanity and mirror you used--love your look!