Color the icons programmatically

[jplevene]

Is there a simple way to color the icons or set the icon style? 

The only way I can think is to add to my CSS:

i.jstree-themeicon.jstree-themeicon-custom  { color: var(--icon1-color) }

and set the css variable --icon1-color as I have a few icons and different users would want different colors for each one.

Just wondered if there is a more elegant method?