I've been asked what tile I ended up choosing for my floor. I wasn't able to get the Eco-Gres Mosaic tile that I wanted because the manufacturer was out of stock. I found a replacement by Daltile. Here's a simulation I created on their website:
This looks NOTHING like my bathroom, but the floor tile and wall tile shown here represent what I have ordered (with the exception of the trim between the floor and the wall, I'm not using what is shown here and I couldn't seem to make it go away).
This is the Daltile Colorbody Porcelain, in their Keystone line. The color is Suede Gray and the tiles will be 2" square.