I'm not sure why but when I ate my avocado today I thought "I wonder what the skin of this is like when it's dried"...like a gourd perhaps? Like leather, it looks a big like it? So I scrubbed out the inside and popped it out in the sun to dry.
A few hours later it was fully dried out and hard, but brittle. The halves warped a little and shrunk. Overall, though, the effect was interesting...useable.
I would imagine if you placed the shell of the skin around a mold you could form some very pretty little bowls. For what, I have no idea. Stamps? Paperclips?
We don't eat enough avocados to do a lot of experimentation but give it a try if you do!