I would.

I never thought to color the white grout white, but that's an intriguing idea. Maybe I should consider that for a long term solution. Is it safe for in the shower too? (The bathroom in question is a tub/shower combo, but at some point I hope to do my master bathroom shower in similar tile and grout.) The grout is much closer to the original white after I let it dry from some serious scrubbing over the weekend. There is a little discoloration near the toilet though, so I think I'll pick up some oxyclean and a mr. clean magic eraser and see what happens. Thanks!

We have stone pebbles and three coats of sealer/enhancer on both the stones and grout. I don't know the types because the contractor did it and we don't have the packages. we put on three coats to keep the stones looking wet and darker. But I do know that it isn't slippery at all. the stones are very agreeably bumpy underfoot. we've only been using this shower for about a month, but so far I am totally pleased with the choice.

Your white penny tile is unglazed. Glazing is the addition of a layer of liquid glass to the clay tile. Although glazing can sometimes scratch or chip, it doesn't stain through. (Unless it's a crackle glaze with tiny openings or cracks in the glaze itself. You do not have a crackle glaze). Your penny tile should be sealed to avoid staining. I don't have any recommendations but a tile store should be able to help, maybe even a big box tile department. Since your other tile doesn't specify that it is unglazed, I think you can assume it is glazed. Sealing won't provide any additional protection to the glazing, so don't waste your time. You might have to use something stronger on the scuffs, like a tile cleaner, but usually surface stains should come up fairly easily. Wax - you may have to soften with a hair dryer and scrape up with a plastic utensil.