What spices aside from 'apple pie spices' might add some unexpected flavors to the apple chips I am making?

You could try adding some curry powder.

I vote for ground cardamom and ginger.

Ground freshly toasted coriander seeds plus the tiniest pinch possible of cinnamon, and a touch of salt.

agave and chile pepper dust

I also use Chinese 5 spice in my apple pie. Specifically the Reims blend from La Boite NYC. Curry powder in moderation might be a nice addition to your chips as well.

Coincidentally, my mom just made ginger, wasabi, sea salt apple chips. I was ready to hate them. They were so good!!

fresh grated ginger and mace

Try long pepper - here's a great recipe for spices apple chips http://www.theguardian.com/lifeandstyle/2013/oct/05/10-best-apple-recipes-bramley-coxes

Some ideas:

* Mint, basil or sage. You can get some exotic flavours like chocolate mint or blackcurrant sage.
* If you can get them, ground tonka bean (it has a lovely tobacco/cinnamon/vanilla/marzipan flavour) but I think it is banned in the US (!)
* Ground dried orange, lemon or grapefruit peel
* Spanish dried smoked pepper
* Sumac powder
* Ground nigella (black onion seed)
* Ginger

I adore freshly grated nutmeg with apple. Not entirely unexpected, of course, but perfect.

I think cardamom would be good.

I like fennel/anise with apple. Also rosemary.

Rose water

How about Chinese 5 spice powder?