Years ago I saw a picture on the back of Fine Homebuilding of a backyard building that had a conical roof covered with shingles cut in an organic wavy pattern. It looked almost thatched or as if it was covered in scales (Dragon Scales?!?).
At the time I didn't need any roofs for circular buildings but I thought - I could make that and I definitely should if the opportunity arises. I mentally filed the idea away for future coolness. Fast forward 15+ years and what do you know? I've got a circular building that needs a roof!
The scaly shingle idea wasn't a winner in my wife's mind though. She never saw the original picture and I guess I wasn't selling my version very well because I never got more than a lukewarm reception to it. We pondered many ideas for roofing material including used tires or recycled highway signs cut into shingles. I couldn't shake the vision of that back cover though and in the end the dragon scale idea prevailed.