i use some livestrong wrist bands on a few lens that do creep. but for the most part, i wouldn't pay for it.
I found a rubber band works just as good.
There's half an idea here... how about a design that adds a focus scale to lenses that don't already have one? Help the folk with kit lenses try hyperfocal etc?
Or another half of an idea, print up the trudeau jar openers / focus pullers with stops to help repeat lens movements?
Somebody give me a kickstarter!
But as an aesthetic thing? trying too hard methinks. As a younger man I had toyed with an aperture tattoo, but nah, not for me.