I can make a default icon that says "I am a moron" for people that don't choose an icon. Maybe if people were to not read the "I am a moron" posts, others would get the idea that you have to actually do something right if you want a response.
at first i thought this was straight genius, but i came to think that maybe its a lil too harsh to do to new people, maybe just have it say like 'undefined' or something...
but really, no matter what youre gonna have the kids like 'how do i make it say something' and someones gonna have to explain it, and this will happen many times, so... lol.
i think the base idea of merging and adding the icons, and a lame default icon is a very good idea, and will pomote neatness and clarity, something all programmers should appreciate.