I am sure your climate and surroundings affect the tone of your soundscapes as much as it affects your art or your film-making. You wouldn't make a film with the desolate look of Babette's Feast if you were in Catalonia.
My first thought was to wonder what would have happened if they gave the same brief to Eddie Van Halen, to get his warm brown sound...
But maybe if Microsoft got Fripp to do the same session over again in a different warm location, with the sun blazing. Maybe if he recorded these sounds in Tahiti it would have the same effect on him as it had on Gauguin and Matisse. Then it would sound blue-green,
I thought this was going to be about XSLT, which is why I started to watch it. But it turned out to be a mind expanding foray into the Windows user interface. Amazing.
All the way through the demo I assumed that at some stage the interface was going to become 3D, but no, maybe because the Windows UI is too far from that right now.
I wonder, did you investigate the idea of making the lists on the left and the right smaller in height by giving them a depth dimension? Some sort of categorisation that would let items sink into the distance, or come into the foreground?