okay that's your opinion not mine ^^ but is scalos makin' this possible?
There are icon tools out there for using any icons you see on other systems on your Amiga, or draw your own.
Also with rainboot and such like, you can add a boot picture/animation with sound effects.
Add some nice WB/window backdrops, and there are tools to load new back drops with each boot.
Workbench bump gives you a bumped mapped image, and the lighting changes as you move the mouse.
http://aminet.net/util/wb/WBBump.lhaVisualprefs allows you to alter the look of your window borders etc
http://aminet.net/util/wb/VisualPrefs.lhais this the sort of thing you are after?