Do you mean like fruit roll-ups fruit leather?
If so, I've found success with applesauce mixed with whatever other fruit. The applesauce gives the fruit leather more stability, and is a good way to "spread out" the more expensive fruit. Usually a ratio of 2:1 for applesauce to other pureed fruit. I add a little bit of lemon juice to keep the flavors bright, and then lay it on parchment paper on top of the provided plastic dehydrator ring.
Applesauce & strawberries is a great favorite of the kids.