I am working on a Saihai-prop for a LARP and I want to wrap it in a way that imitates a Stingray skin on the handle. However some stingray skins can't be traded legally under the Washington treaty, so I need to substitute for the real stuff. I technically could buy pearl-ray skin, which is legal, but that would mean I need to get a lot more of the leather than I actually need: the handle only is about 150 mm long and about 50 mm in circumference.
How can I make an imitation of the bubbly texture of rounded domes that is characteristic for a stingray skin, which can then be wrapped around a wooden handle?