The option for loading a reflection image would be a pretty interesting feature too! For an example, in Vista/Windows 7, when windows are moved, the reflection(shine) in the titlebar moves as well! I think alot of people are pushing this as well because there was a third-party software called glass-8 which brought back aeroglass from windows vista/7 for windows 8/10 and it worked really well! It had all of windows 7 features and then some! Since the developer have gone MIA, I think everyone is pushing for curtains to gain these features, which the transparency itself is why I bought Curtains. At the very least maybe this could be considered for WindowsBlinds 11?
DISCLAIMOR: NOT TRYING TO ADVERTISE!
(in this video at the selected time, gives an example of aero glass on windows 10, and how it works! also shows the reflection being added and working the way it did in windows vista/windows 7!)
(Windows 7 titlebar reflection image)
for an example on how aeroglass worked on Vista/Windows 7
(not advertising just trying to give examples! and I believe Aeroglass is hooked into DWM)