I've been using this theme with WindowBlinds8 since 2013 (Ion by neone6) in Windows 7 and I absolutely loved the blur behind explorer and context menus everywhere in the OS.
Screenshot (Windows 7 Ultimate, WindowBlinds8, Explorer):
(had to blur out a lot of personal info since this screenshot is from a random screen recording from a year ago)
I've gotten used to this theme over the last 8 years. After finally switching to Windows 10 this year, I did a good enough job at making it both look and feel exactly like my Windows 7 install.
Screenshot (Windows 10 Pro v20H2, WindowBlinds v10.89, Explorer):
The only thing missing now, is the blur behind explorer and overall transparency / glass effect. I have used Glass2K for transparency but I can't find any way to add blur behind explorer windows. Only transparency without blur doesn't look nearly as good, and is very very distracting if I'm multitasking and have multiple windows open / stacked on top of each other.
I've seen screenshots from the Curtains update where transparency and blur has been added, and it looks amazing, but sadly, I can't have this exact theme with Curtains, and Windowblinds/Curtains can't work together either.
I would love to see blur and transparency behind windows with a future WindowBlinds update! (just like in curtains, preferably glass blur)
It'll be even more amazing if this blur could work on any program's window across the system. (programs like notepad, settings, etc)
Since windowblinds hooks it's DLLs into all skinned programs system-wide, I hope it's possible to make it work.