We live in an age where open air preaching is tuned out and door-knocking can get you shot.  Given that the mall is the new agora, and since traditional (old-fashioned?) preaching methods are rarely given a fair hearing, perhaps taking our worship out of the sanctuary will preach for us.  Here are two examples of such out-of-the-box approaches:

Flash Mob in the UK

Lunch with Handel in Canada