I love love love Subway Tile. It is just like normal tile except rectangular shaped, 3 inches by 6 inches and usually laid in a brick pattern.
It will for sure be the back splash in my dream kitchen- probably in a pale green color, or maybe in white with pale green walls. It was very common in homes in the early 1900s and has become quiet popular again.
Here is a company that makes it and can explain it a bit more: www.subwaytile.com