Ah, ok. I've seen the icon will work for what I wanted.
Just put it in Ram, rename it to def_AmiModRadio.info, leave it out on the screen, put it where you want it to stay, snapshot it and then Put it away again inside Ram, then just put it into SYS:Prefs/Env-Archive/Sys and reboot.
Now when you start AmiModRadio and you iconify it, this will be the icon it will use 
Edit: I've made two sizes, 46 and 64 and changed both, attached.
