We carry a similar tile here: http://www.subwaytileoutlet.com/products/White-Ceramic-Subway-Tile.html
Gorgeous use of subway tile! I love this kitchen!

We produce historically accurate subway tile with a perfectly flat surface and rectified edges for a pencil thin grout line. We offer our tile in many colors including three different finishes. Please visit our website at www.subwaytile.com to view our complete line with all of the necessary components to complete the entire project. Also click on our mosaics tab to view our line of gorgeous floor tiles that complement the subway tile beautifully. Call for samples 888-387-3280. Heritage Tile looks forward to hearing from you and we love to hear about your projects!

what color is the grout?

Historically, the grout would be a medium grey because dyes were not used in the aggregate. However, today the grout color is a personal preference. Using a white or light grout creates a uniform appearance where the grout lines fade into the tile visually. A darker grout sets the tile off accentuating the grout line and defining the tile itself. In the picture immediately above, it looks as if the wall grout is white and the floor grout is grey. However, in the two other pictures it looks as if the grout is grey. Please see these great representations of our subway tile. We can be reached at 888-387-3280 or sales@heritagetile.com if you have any questions.

Your sea foam green tiles are the best!