They way i do any block i'm figuring out (don't buy patterns myself) is with graph paper. Get yourself a book of graph paper ( 1/4" grid is usually easiest to work with) and some colored pencils and duplicate one of the squares (noting the individual pieces in different colors) on the graph paper. Then YOU decide what size each of the graph paper grids squares are for your quilt ..... say you decide each one represents 2 inches.... that will give you your finished sizes for each individual piece - add your quarter inch and you have your pattern piece sizes....which you can then make yourself.
Best of luck.