Theme

You could use Windowblinds or you might find something on DeviantArt, say, but you'd need to avoid any that use Aeroglass (program) as that's no longer maintained and isn't compatible.
Random examples:
Windows 7 Theme for Windows 10 by WIN7TBAR on DeviantArt
Windows 10 Themes for Win 7 Final by sagorpirbd on DeviantArt

You could explore this: I'm not sure it really turned out like Win 7...
SevenTheme Overview

I've gone for something relatively non-intrusive - Stardock's Curtains with 1 theme offering limited translucency, and IconPackager providing Vista's icons (was using Win 7's by another means formerly).


Oh, and Open Shell has an orb.