feature request: custom window accent colors

[boldcompany]

This is a very cool add-on.
It would be helpful if a user could optionally assign each window a color accent, to help quickly distinguish visually which window is active. This could be as simple as a small color marking somewhere in the interface, or as extensive as a per-window theme.

[l10nelw]

Customizable name badge colors is in my wishlist.

[ssssamstrup]

Seconded, or icons/emoji. Just tried using an emoji in my custom window name, but couldn't. ;)