Hmmm.... I did a lot of flax crackers for a while, because I love those. Fruit when it's in season (homemade dried fruits are much better, for the ones that dry well). I've done a few veggies, but never found a method I'm super happy with. Some "cookie" type things too. When I was backpacking, I would make my meals and dehydrate them to bring with me (dehydrated chili rehydrates VERY well).
I highly recommend looking at raw recipes - cookbooks, blogs, etc. They often have things that require dehydrators.
WOW Thanks for the tips! I really like the flax crackers idea!