You could use them, together with the core, to make apple-glaze (for your pie).
Cover everything with water, simmer about 30 min, strain, simmer until you reach the desired density.
cooking.stackexchange.com/users/641/BaffledCook
You can do something similar to how low-end vodka is made from potato peelings: Take all the peels, stuff in a blender, and liquefy with as little water as needed to make a fairly liquid slurry.
Dump into a large pot, bring to a boil, cover, cool.
Dump into a fermenter, add yeast, wait a week, strain, add a clarifying agent, return to fermenter, let rest a week, distill, recombine with water/sugar/apple juice to flavor: bam, free applejack :)
This takes some know-how with respect to fermentation, and some effort to set up the fermentation, but if you have loads of apple bits (like from pressing cider from 6 or so bushels), it is kinda worth it for free booze from nature.
cooking.stackexchange.com/users/624/Adam Shiemke
This isn't exactly a culinary use, but apple peel is apparently a very popular exfoliant .
cooking.stackexchange.com/users/41/Aaronut
The other day I stumbled across this recipe for apple butter that uses the peels.
It's made from apples as well
, it's not just the peels, but the author specifically mentions that she dumps any extra peels (i.e. from apple sauce or apple pie) in the crock pot in order to increase the yield.
I haven't tried to make it, but the photo makes it look pretty delicious.
cooking.stackexchange.com/users/41/Aaronut
There are some "creative" suggestions towards the bottom of this page .
(dietary supplement, jelly, string, ...).
cooking.stackexchange.com/users/1393/Michael Natkin
Apple peels combined with any citrus slices and/or peels, a cinnamon stick, some whole cloves, and some allspice makes a great potpourri.
Cover with water and maintain at a very low simmer on the back of the stove.
It makes the house smell homey and comforting from the minute you walk in the door!
cooking.stackexchange.com/users/3577/Mrs. Garden
I made an apple pie the other day and peeled 6 or so apples.  I ended up composting the peelings, and it got me wondering, what else could I have done with them?
What can I do with apple peel?
cooking.stackexchange.com
<culinary-uses><apples>
cooking.stackexchange.com/questions/6601
cooking.stackexchange.com/users/210/Sam Holder
It can be used with the core for a glaze for your pie, or together with the rest of the apple for apple butter. Apple peels can also be blended to make a kind of low-end vodka, made into an exfoliant or combined with any citrus slices and/or peels, a cinnamon stick, some whole cloves, and some allspice to make a great potpourri. Apple peels can can apple butter, apple alcohol or be used as an exfoliant or pot pourri.
You can use them to make an apple glaze or for apple butter. Apple peel can be a good exfoliant. You can make alcohol from apple peel. You can use apple peel for potpourri.