I really like 21 Guns. That and Boulevard of Broken Dreams are my personal favourites from Green Day, I don't think I've heard many of the others, at least not recently
I love Green Day, but I prefer their older stuff because it was a bit more rocky. I'm not one of those people that suddenly hated them when they released American Idiot though; I like some of their newer stuff too. Try their earlier tracks though, Gus.