Browsing 1992 through 1995 gave me tears. Btw, where is Vista, ME, or Windows 98, or 7 for that matter? Vista had an especially unique UI with Aero and Windows 7 was an adaptation of that I believe.
I used to be among those Linux users that wanted to make the GUI look cool™. I spent a LOT of time browsing gnome-look.org and at the height of Vista popularity, the Aero knockoffs were everywhere.
I believe Windows 98 and ME were omitted because this is largely a presentation of the evolution of GUIs. Windows 98 and ME did not substantially differ from Windows 95 in terms of their look-and-feel; the same can be said about Windows NT 4 and Windows 2000.
The only differences I remember are quick start icons in the taskbar, and gradients in window title bars.