I haven't used fly stitching a lot in the past. I've done it mostly for leaves like these two:
The left one is from a heart for Chains of Hearts, and the right one is from a Moms CQ block.
Another time I used it was on a Moms CQ block, making a fan this time:
I'm going to do something completely different with it this time, and I'll be working on that tomorrow afternoon. Yay! Click to enlarge pictures.