It would be nice for custom bookmarks to show some kind of visual indicator they have been customized

Right now, I believe there is no visual difference between the default bookmark icons and ones that you have set to be custom. I would like to see just some indication that for instance, if bookmarks 1 and 2 have been customized...the numbers or the outline could turn gold or whatever...while bookmarks 3-5 remain the default grey color. Or something.

thanks
Corry