Yup I played with the brushing on technique a bit when I was anodizing. It worked well enough, but since I’m not a skilled painter I always ended up creating designs that looked childish, so I stuck to solids and fades.
Jon’s technique is a combination of heating and the manufacturing process of folding and layering the titanium. The heating part you can do after the yoyo is created, but the folding part has to be done while the yoyo is being made. Thus, it would be impossible to offer his designs as an aftermarket service. It’s part of the manufacturing process itself.
That said, these are absolutely killer. Super jealous!