I know what you're talking about because I wanted to choose the same type of tile for a backsplash and can't seem to find it anywhere.

After an extensive Google search I was able to find a supplier local to me (in Toronto).
I've attached a link to a San Diego supplier, since your profile says you are in the US. There are some pictures on the site that may be similar to what you are looking for.

Here is a link that might be useful: Natural Stone Outlet

spacific has a bathroom with this tile, and I know she loves it. (I saw it on a visit and I would have done the same thing in a heartbeat but we were designing a bath for potential handicaped access. sigh)

Here is a link that might be useful: spacific

The entry is still there-its on about page 4, I think, of the bathroom forum. Let's see if this link to the picture works

http://pg.photos.yahoo.com/ph/casey_bauer/detail?.dir=562a&.dnm=7085.jpg&.src=ph

You can also do a search with the word "pebble" and find a few other threads as well.