Is the Platinum the Laticrete Platinum? If so what about Silver Shadow? It is a very soft gray that is almost white, but looks great with Platinum. Are you using cementitious grout or epoxy? I know many have used SS for their light or white tiles. Here is Silver Shadow epoxy on the bottom vertical grout spaces. The top area was grouted with a 50/50 ratio of Platinum and SS. The middle row was with Raven and SS. Note that there is a halo around the marble, like it is still wet. Epoxy can do that with marble, I just looked at my tile boards after over a month of drying and the halo is still slightly there with the darker grouts. But not as marked as in this picture. So that is something to consider. Here is the Silver Shadow epoxy with my bright white tiles. With these tiles the SS looks light gray, but with the tiles above it looks almost too white for my taste: I took Laticrete epoxy Platinum and mixed it with a little bit of Silver Shadow for an in between gray for my black slate floors. It is in a 3:1 ratio. The colors mixed very nicely. The grout sample on the left is the SS and the one on the right is the Platinum. It didn't take much SS to lighten it up significantly. If I did this over I would just have used Platinum. My DH really likes the combo. He thinks it ties in with the tub. It is relative isn't it, because it is not white at all but appears white. I will be having a marble listello, as seen above in the sample board, with my white tile wainscot. I might mask the marble off when I grout the white field tile with Silver Shadow. Then I would plan to come back and grout the marble with a reverse blend of Silver Shadow 3parts to Platinum 1 part. Nothing like trying to complicate things. That's one of the benefits with DIY. But if I was paying someone to grout, I would not consider these mixes.

Thank you guys. I really appreciate your help. My brain is fried and this decision has to be made immediately. gthigpen....I freaked out when I realized that the white was going to be a mistake. I cancelled it just in time but they are waiting on me to call in the color so it can be ordered. Sad for you that you didn't catch it...I hate regrets. My dd did the same thing with penny tile and white grout. A sea of white. Ugh. It's still pretty but she hates it. Gthigpen and Jackie...I see that you are using several colors of grout. I don't have that in me and I don't have a designer to advise me. I wish I did. Do you think it will be ok to choose one grout color i.e.; Silverado...and use it on all of the tile in three different bathrooms for simplicity's sake??? I have subway in two showers and in one tub surround. And the black and white on three floors and two shower floors. Here are some pics. Please advise and thank you so much for any wise words.

A shower pan needs depth so that they can add a slant to allow water to drain. Only 'curbless' showers are level with bathroom floors. And those need +++++money/time/work to get done. A two inch step-up height for a shower pan is nothing in the scheme of things. So long as the slope and drainage are calculated properly, this should be no problem.

I forgot the picture.