Sorry if I'm asking too much or if it is inappropriate, and it is a long shot any way, but it is the best I can think of. I had my bathroom done in these tiles over a year ago, and I have to do some work and will have to break some of the tiles. Unfortunately I can't get in contact with the guy who put them up and ask him where he got them, but maybe somebody here happens to know where to get them or what they are called. It will help if this is in UK :-)
Here's a picture:
So, any guess?