I've only begun adding patches to my vest since april, so I don't have many.
Blind Guardian, Iced Earth, Manowar, Dio, King Diamond, Megadeth, and Iron Maiden.
I want to get Amon Amarth, Kamelot, and Queensryche. and maybe Sodom, but I've only heard 3 of their albums so I gotta listen to more of them first.
As for a back patch, I saw a Somewhere In Time patch but other then that I have no ideas yet.