this is the simple but effective idea:
to use the AnimatedShortcut docklet as an Automatic Icon Changer
this way you can periodically rotate as many icons you want (the same concept of any wallpaper changer)
on setting the docklet the only parameter to consider is the time delay you have to choose a quite long period
(in milliseconds: 10.000 for 10 seconds or more)
you can even stick with 1 icon temporally or definitely stopping the rotation (in this case check "toggle animation")
just needed the usual pngs strip with let's say 10 different icons assembled then you'll have 10 icons in 1 place !
have a look at my first example https://www.wincustomize.com/skins.aspx?skinid=16250&libid=29