Apple peels are one of those scraps that don't really seem to have a higher purpose, but leave it to the folks at Food 52 to find a (boozy) use for them. Just toss 'em in a bottle of bourbon and in no time you'll have a fancy infused liquor to gift or enjoy by yourself.
Honestly, I don't usually like my bourbon to be anything but bourbon-flavored, but a splash of this in a glass of ginger beer doesn't sound so bad. The peels of about six apples are enough to flavour a 750ml bottle of bourbon (I would use the cheaper stuff for this), and the only other ingredients -- a cinnamon stick and two cloves -- are pretty easy to come by.
Just dump everything into a jar and let it sit at room temperature. Remove the cinnamon and cloves after a few days and the peels after a week, and this tasty infusion is ready for action.
Apple Peel Bourbon [Food 52]