Now that is a hard question and almost impossible to answer. However, you say "how much.....until I get to the store and get the pattern" Why do you need to know before you get the pattern?
Having said that, I would probably get whatever the length of the quilt might be.......knowing that it will be more than enough Another way would be to try and figure out the size of the focus block, from the picture, try to determine the size and then multiply for the amount of yardage.
and it also depends on whether or not you are making the 18" blocks or the 6" blocks.
Last edited by Holice; 12-06-2012 at 08:02 AM.