Excalibur dehydrator (buy directly from the factory: they have some great deals.)
This is my second attempt so far, and it has been a partial success. I put ripe strawberries, mango, and melon pieces in the blender with some lemon juice, because I remembered that pectin was an important ingredient in many commercial leathers. I added flax seeds and pureed the mixture. Then, I spilled it over my silicone mats and shook them a bit to guarantee an even spread, and started the dehydrator at 135 Fahrenheit. After about six hours I got what you see here. I suspect that a thicker layer would be more flexible and less brittle, but would take longer to dry; I'll try that next time. But I should point out that even the mistakes are tasty, and I plan to continue experimenting.
The thing also makes fabulous banana and strawberry chips, and I plan to use it to make seed crackers soon.