Well, there's a 'Load interface presets' button in the 'File menu / Options menu item / General Preferences' window.  However, there doesn't seem to be any interfaces shipping with my version.  Also, there's no browse button in this load interface dialog, so the interface presets must be in some predisposed location.  IMHO, this load interface colors looks like a WIP.

You can customize interface colors by choosing interface colors for various Vue 6 interface objects. The choose button is next to the 'Load interface colors' button. I'm not sure where the interface colors are saved. I believe they're saved in a configuration file.

Charles