I tried the paper piecing with hexagons but had to omuch variation and wiggling going on, so I bought the mylar hexagon templates with the hole in the center from Brandy's online. The templates pop out with a chopstick when you're done, there's nothing to print or iron on, and they last forever. PERFECT hexies every time! They're sold in several sizes (the size is the measurement of one edge/side), and other shapes are available as well. Highly cost effective.
I've been able to repair and fill in unfinished Grandmother's Flower Garden blocks, runners and quilt tops very effectively.