Been looking for weeks for this specific subway tile...Not sure if its glass or ceramic or stone.. Maybe you guys can help me get lucky!! Here is a link that might be useful:

Try these: http://www.missiontilewest.com/styles/revival/boards/dealerinfo.html and these (make sure you scroll down by using the thin red bar on the right): http://www.missiontilewest.com/ These are the tiles I am hoping to use for my kitchen back splash, but while doing an image search, came upon this thread. They will customize the colors in any of their deco liners, but they are not cheap (approx $12.95 for a 1 x 6" custom liner tile). I copied their revival line drawings and mocked up different color combos on my computer to see which pattern and which order to do the colors. I am 99% sold on using these but the cost is making me do one more search to see if I can find similar.

Looks like Sonoma Stellar Isla https://sonomatilemakers.com/product/stellar-isla/ Retail around $30 - 40/sq.ft There is a bigger version of the pattern too https://sonomatilemakers.com/product/stellar-marea/ Look at their website for local tile vendors that carry their line.

Sonoma Tilemakers Stellar line. I just finished a bathroom reno and used Sonoma Tile and I’m very happy with it.