Have you thought about using a quartz material such as cambria. I attached a picture. But there are so many colors by cambria you could get the marble look with the Quartz benefits.

Terri, you realize you still need a curb, right? A shower floor is higher at its perimeter, and slants toward the drain. For a small shower, tilers recommend 2x2" tiles or smaller, so the slant is discreet. Do you like a steamy shower experience? If so, you'll want a shower door. Frameless (with metal only at the top) is a nicer look than framed. Do any of these bathroom photos help? The second one is a 5x8' bath, whose frameless shower replaced a tub. It's comprised of a stationary panel and a hinged door that swings both in and out. Clear glass makes the room look larger, and lets you admire the tiled walls and floor. However, if you're not dedicated to squeegeeing after every shower, soap scum will build up and will be more apparent on clear glass. My second choice is called "rain" glass. Shower door fabricators now have a polymer they can apply to the glass that makes the water slide off better, like the Rain-X we use on our windshields. That helps for the first year. You can see more of my showers in my public projects. Look for "Clovernook Bath" where you'll see a corner shower made of rain glass.

The samples all look pretty much the same on my monitor. Am I losing it? With that tile, you might go with taupe. There doesn't seem to be any charcoal in it, and cream might be too yellow.

I think I'm following you Pennydesign. You are saying the sheetrock might be bulkier which then the tile would not be able to meet it properly. Is that right? I will have to check the caulk line for the shower door. I haven't even thought of that. We are using a frameless door. If centered I think it would fall just to the left of the center of the curb. I'm assuming you want the door centered on the curb ideally? Don't many people have a grout line there using bullnose? There should only be three places where screws will be used and we have 2x4 support built in for that behind the tile. Could that be a problem?