Hi, I don't think it's a particularly common one. I wonder if there was a particular reason why you wanted this one? From the descriptions (I've never seen it) it doesn't seem too different from many. Avoid Sedum album and possibibly sedum acre but there are many others that look similar. Sedum dasyphyllum has ting fat blue green leave and pink/white flowers. That might be a good one to start with.

The tile in this bathroom goes up to about 56" (48" of subway tile + about 8" for the trim pieces and mosaic border) above the floor -- which is higher than you would normally go. The reason I did it so high is because I didn't want the decorative tile border to hit the medicine cabinet in an awkward location (i.e., I didn't want to have to cut into one of the trim pieces or the strip of mosaic to fit the bottom wood trim of the medicine cabinet). A downside of having the tile so high is that the light switch/power outlet is also higher than normal (since I didn't want to put that in the middle of the tile, either) -- so young kids can't turn on the lights by themselves. I think 48" is a more standard height -- but I would think about how the tile will fall relative to any other elements you need to work around (e.g., medicine cabinets, windows, light switches/outlets, etc. Here's another bath that I tiled up to 51" (48" to the top of the subway tile plus 3" of trim) -- the black liner ended up fitting in perfectly with the bottom trim piece on the medicine cabinet:

Before you use all those toxic cleaners the regular (non health-food) grocery store sells, think of what it does to your body, if it's doing THAT to your marble. Most of getting rid of the germs is removing them from surfaces, not launching an all out nuclear attack. I think you should try the same tests you did on your limestone on a Ming marble sample. I had a gorgeous pink marble tile floor in the hall/kid bathroom in my old house. The bathroom was also the home of the washer and dryer, and all associated products (for me, those would be 7th Generation detergent, baking soda, and vinegar). At the time, we had 4 kids (3 boys!). I would do the marble again in a second. Now, I did not mind that the floor got scratched and scuffed. I considered that a patina, and that it made the floor less slippery. When we moved out, the floor was not as glossy as the day we put it in, but it still looked beautiful. I did use a little bleach around the base of the toilet, to get the grout white again. This was after 3 years of boys in various stages of potty training. I have been to Italy, where marble floors and countertops are ubiquitous. In the very old houses, the marble just has a matte finish. In Baltimore city, the old rowhouses are reknowned for their beautiful outdoor marble steps the ladies would scrub EVERY day. Toxic bathroom cleaners you buy in the regular old grocery store are bad for your health and the environment anyway. You can clean your whole bathroom with things like baking soda, vinegar and water in a 1:4 ratio, steam (I got a $30 steam-cleaner at Tuesday Morning -- the steam kills EVERYTHING loosens up all bathroom gook, etc. with no toxic fumes. It's just water!) Seventh Generation makes a kick-arse toilet cleaner. If you want the bathroom to smell clean and to kill germs and mold without ruining your body or your marble, put a couple of drops of essential oils of lemon, lavender, eucalyptus, rosemary, cedar, pine, tea tree, tangerine, or some combination thereof, in your homemade cleaning solution. It only takes a minute to put a glop of Bi-O-Kleen all-purpose cleaner degreaser in a spray bottle, fill up the bottle the rest of the way with water, shake it up, and go to town on the bathroom. I promise it will still sparkle like you used the Dupont and Dow crap that uses known endocrine disruptors.

I think the white and light green sounds like a beautiful plan, very peaceful. Less contrast makes the space look bigger; that's what I did in my small kitchen. I'd look around at local stone yards. If you can't find slabs of ming marble, or if it isn't a robust counter stone, there are some lovely light green granites that might give you a similar effect. Maybe something like costa esmeralda? The one remodelfla posted is gorgeous. I also saw a light green soapstone at one place.