In Firefox the Browser can support a .jpg .gif .png as it's favicon and will show it. AND even IF the picture is Big it auto re-size it to a 16x16 to display in the tabs. I'm not sure if it would support an animated.gif but it does support an Animated.png

IExplorer however; Will not show anything that is bigger than 16x16 AND if it's not a .ico at the ending and I'm not sure if just renaming a .gif to a .ico will work.

So could you make a randomizer that changes all the pics in the list to 16x16 and in a .ico format automatically?

and a 2nd stage would be making an animated .ico in the list



Just found this recently http://en.wikipedia.org/wiki/Favicon

http://tools.dynamicdrive.com/favicon/

http://www.winterdrache.de/freeware/png2ico/

http://www.favicon.cc/