GitHub - neuromorph/openbar: A GNOME Shell extension for theming Gnome Top Bar / Top Panel, Menus, Dash/Dock, Gnome Shell and Gtk/Flatpak Apps.
github.com
A GNOME Shell extension for theming Gnome Top Bar / Top Panel, Menus, Dash/Dock, Gnome Shell and Gtk/Flatpak Apps. - neuromorph/openbar

I don’t run a lot of extensions on Gnome, but this one is a great way to add some customisation to the desktop.