I myself had some ideas for future amigas to get the best icon-set done. My idea was animated icons, maybe gif or mng (anim-png). Even have a separate sound when you click on them. Like the RAM disk icon, it has a blue flash going over it from top to bottom when selected and gives the electric "zzzzoom" sound. :-)
Then i saw ho small Lightwave objects (or even Imagine objects) could be and thought: Hey, why not use them as icons? With the correct attributes and colors they would look great, they also would be fully 3D, means you could always rotate them with the mouse by clicking the edge and rotating it to your best position. So that would free us from the pseudo 3D look that came with Newicons. :-)
Icons could be autosnapshotted, so we wouldn't need to select snapshot icon (to hold it that way) everytime from the menu. But there should be an UNDO entry in the menu though, just in case somebody wants back his last selection. :-D
With that feature, we could finally get a full 3D Workbench, which i always dreamed about. :-)
