Well, I tried.
I had a surplus of peaches and saw a really great recipe for using all of the peelings that I created while processing and freezing them. Sounded great.... except.... after waiting the 24 hours afterwards that it recommends, my jelly didn't gel.
BUT -- it makes some really delicious peach syrup. That's how we'll use it!
Here's the recipe in case you have better luck then I. Thinking back, the only thing I did different was to double the recipe, so that may have been the reason it didn't work. Next year, I'll try again.