Here's my recommendation for trying this technique...
-Iron your fabric cutout pieces to a piece of heat n' bond, by following the instructions on the package (Some people cut out their shapes after the fabric has been adhered to the fusing sheet, but I feel like I waste less when I cut the shapes first and lay them on the sheet like a puzzle...you can also put a piece of butcher paper on top to keep the "goo" from getting on your iron)
-Trim the excess heat n' bond off your shapes, peel the backing, and arrange them on your fabric block.
-Iron the pieces in place
-Using your darning foot, free-motion stitch around the inside border of each shape. I like to go around twice or more to give it a really "sketchy" look.
Pretty simple stuff! Unless you have a machine who has to be baby'ed every time you want to free-motion....I am still on the hunt for a new quilting machine ;)