I did one a few years ago. I had 8 different fabrics, 4 lights and 4 darks alternating them in a stack. Then I cut from one side to the other, at least 1" from the edge. Take one of the top pieces and move it to the bottom of the stack, then you sew them together. After you are done, you stack them again and cut from the other two sides that you didn't cut on earlier. Do the same with the one piece to the bottom and sew them together again.
When you are done with all the blocks, then you square them up to the size you want them..........I took the smallest one and squared them up to that size...........then sew them together.
It was just 4 different fabrics per block. And you can make the blocks any size you want them to be. I have seen them in 15" to 8".
That's how I did mine.
Barb