It would be very nice to select icons fitting the L&F of the current System GUI - the current icon looks a bit out of place on modern Windows Versions, especially when you keep the tray quite clean. I have only the system symbols and CF permanently shown and it would look much nicer if the CF icon matched the style of the system icons (network, battery etc)

Thanks, cool! And yes, Win10-ish icons would probably look just as good on anything newer than XP, so there should indeed be no actual reason to make them selectable.