We found them at a local wholesale tile store. They don't sell to the public, but referred us to a retail store that buys from them. My wife and I are not very creative (artistic?), and we were everwhelmed with all the tile choices. What helped us was this showroom had quite a few "mock up" bathrooms, some as small as just a vanity with backsplash. It helped us to see the tiles up on the walls. It turned out these were very affordable, so we splurged on the listello and half round border to add interest.
Oh yeah, after we bought them, I was up at HD buying tools and found they sell the same tile! But I keep telling myself that the ones at the Home are seconds.