I think Peter's iconset it wicked. I think mavhc is totally missing the point about people who want to customise their desktops with new icons.
I realise that icons are meant to represent their purpose (and god did I hate having to learn about all this in HCI) but most people who customise the desktop already know what the icons do and, in the case of RISC OS, know where they are. The people who don't customise are generally the ones who don't like to mess and like things the way they are.
You've also completely contradicated yourself about good and bad GUIs specifically your ideas about zooming with a 'scroll bar'. The name sort of explains what it does - zooming is not scrolling mate - not in anybody's language. GUIs are not just about icons they're about ease of use and functionality and I think you'd find something like that would be far to alien to put a a general purpose GUI like Windows, RISC OS or Mac OS.