Choosing the fabric and how to cut and lay it out in repeats was covered in cutebuns class here on the board. She was teaching OBW's, but the technique is the same. You will be working with 4 repeats instead of 6 is the only difference.
Fabric choices
http://www.quiltingboard.com/t-34937-1.htm
Cutting the fabric repeats
http://www.quiltingboard.com/t-35685-1.htm
When you have your 4 repeats cut and stacked as shown in the second link, you would cut your blocks out of these strips, and then cut each of the blocks corner to corner. Pick up one stack of these cut pieces and arrange it into a posey block. Each block cut into 1/4's will make 4 posey blocks.