There is a block called disappering 9 patch that uses three fabrics. When made it looks very difficult, but it not. I do not have a picture of one, but here is the instructions for the block.
4---5" squares (light/medium fabric) these are the corners of your 9 patch
4---5" squares (light/medium fabric) these are the squares between your corner squares
1---5" square (darkest fabric) this is your center square
You will be making a 9 patch blocks, then cutting and resewing the square into the blocks.
Once you have sewn together your 9 patch block, you will need to measure and trim your block if necessary. Divide the size of your block in half and cut your 9 patch into 4 equal pieces.
Rotate by 1/2 turn the section in the upper right and lower left corners.
Sew the squares back together. Each block will look the same when finished.
Hope you can understand these instructions.
My guild is using this pattern to make quilts for our community service projects, the Pregancy Care Center, and the Child Advocay Center.