That's what I thought too, but when I saw "ceramic" on the box at Home Depot, I double checked the Daltile website and found this: http://www.daltile.com/documents/salessheets/DT_Octagon_SS.pdf

Bill, You have been so helpful. This is a true tile job that has been a disaster. First, the wrong tile was installed in February (after being told before it started). Second, the thinset was not removed from the first job and the floor cracked all underneath the tile laid again in March. The correction to the second job did not come until July. They could not fit us into their schedule. They did not use the grout requested by us, refused to put in the expansion joint when questioned and said it did not need one. Lastly, the grout dried completely uneven in color, not to mention being poorly laid out in the division of lines. A salesman came to look at the job today and said they would grout on top of the tile. Is that normal? I am so sick of this project!!! We have been without this second bath except for a sink since Februrary 3rd. Surely this can not be normal for a tile job. Strangely, they act like everything is normal. I feel like we need to get someone out to look at this job before we accept what has been done. However, it is apparent they are incapable of doing a normal tile job.

I am in the middle of a similar remodel. Walls and shower are Daltile white subway tile. Vanity is espresso with calcutta top. Walls are BM gray wisp which is the BM equivalent to RH silver sage (gray, green, blue) Tub is Bain ultra basa duo. Toilet is Toto ultramax all in white. Accents are brushed nickel. My floors will be a limestone called mystic green, also called pistachio green. Really not green at all but beigy with a hue (just a hint) of green. It is the limestone with the fossils in it and my kids and I and DH just love how interesting it is, especially with all the white! I'll post pictures next week when it is finished.

I don't have that particular tile combo, but I did seal my tile grout after it was installed. The porcelain tile doesn't need sealed obviously, but I would definitely seal your grout. I used a nice soft watercolor brush and just brushed over the grout lines. I guess you could use a sponge over the entire area, but the sealer leaves a haze and you need to clean it off - that's why I just used my brush. It wasn't a huge effort. I used Tile Tech.