they are done individually. sometimes called framed. look for a tute here on hickory nuts I think they called them. anyway, I cut my hex's and batting the same size (if you want batting). then cut the backing at least one inch larger. laid the batting right side up, placed batting and hex fabric on top. then folded one "straight edge" backing over 1/4 inch to touch the hex raw edge, then fold over 1/4 again. this last fold will come over the hex fabric. pin, go to next edge and fold and fold, pin. then keep going. then either hand stitch that backing down or machine stitch. also can stitch inside the main hex fabric with a design. it's sort of quilt as you go. Enjoy.
http://www.quiltingboard.com/tutoria...ks-t27345.html