I have no idea when this block was created. Stairway to Heaven is easy to look at, but hard to describe. I'll try to explain it this way. W=White R=Red B=Blue. Here is the layout. Pretend all 3 colors are all solid and using one piece per color. Also, each individual block is one square of any size of fabric. For this example let's pretend our squares are 6 1/2 ".
R W B R W B R W B R W B R W B
W B R W B R W B R W B R W B R
B R W B R W B R W B R W B R W
R W B R W B R W B R W B R W B
W B R W B R W B R W B R W B R
B R W B R W B R W B R W B R W
Basically, you go in the same order across, but start in a different place each row. When finished, no two squares of the same color will be next to each other or on top of each other. ALL the squares will be the same color on the diagonal.
I don't know if it has another name either. I wouldn't even know where to begin researching something like that!
Does this help at all?