Custom Stroke Styles
inDesign has a number of Easter Eggs in the stroke styles: Woof, Rainbow, Rasta, Happy, and Lights. So obviously there is a way to create custom stroke styles, but it is locked and inaccessible. Please let us import our own vector objects into the stroke styles panel.
I have the same need and in Adobe's manual page, it did mention all the above-mentioned stroke style, and currently you cant even add colour to your stroke, or even create your own wavy stroke
Ben Cracknell commented
Good idea, this would be a really useful feature. I'm trying to work out how to get a rule with pointed ends. Quite simple you'd think, but I can't work out how to do it as part of a paragraph style.