There is a matching floor tile, also on the HD website -- look beneath the tile description for more variations.

Have you seen the tile in person? It's impossible to tell from a website what it really looks like. You cannot see what the sheen is or whether the pattern repeats too closely from tile to tile (a dead giveaway that it's not real stone).

Can you use ANY Daltile or just certain ones? Daltile offers a lot of lines that aren't offered at HD or Lowe's. A "real" tile or flooring shop should be able to show you at least some of them.

DalTile has a lot of really good quality, classic tile that I think will do very well for any house. I would pick these:

http://www.homedepot.com/p/Daltile-2-in-x-4-in-White-Mosaic-Wall-Tile-010024BWHD1P2/203213517#.UX8B3SufGDo

with one of these for the floor:
http://www.homedepot.com/p/Daltile-12-in-x-12-in-White-Ceramic-Octagon-Dot-Mosaic-Tile-65012OCT01CC1P2/100187756#.UX8BtCufGDo

OR

http://www.homedepot.com/p/Daltile-Glazed-Porcelain-13-in-x-13-in-Concrete-Connection-Steel-Structure-Tile-CN9113131P6/202623220#.UX8CvyufGDo

And use the same pale gray grout for walls and floor. Most designers go for simple white tile because it always works. You don't have to overthink it.

Here is a pic of a bathroom done with white 2x4 wall tile and hexagon floor tile that looks like what I was thinking you should try. Good luck whatever you choose.

Here is a link that might be useful: White tile bathroom

If you look through the reviews and customer pictures on the HD website you can get a sense of how much variation there is in the tile patterns. The description doesn't say, but the pictures look like it is a polished rather than matte finish. It looks like it could be a nice, cost effective choice - winner in my book.