the key to choosing a print for one block wonder (OBW) is knowing the “repeat” of the design. You must understand what “repeat” means in order to even cut out the fabric pieces. If you are not familiar with the term “repeat” , look it up or better yet. Buy the book. Everything you need to know about OBW is in the book. Fabric with a lot of white or background space is usually good for OBW and the larger “repeat” in the design to get the OBW block size.