So this was somewhat of a success in the Ashes forum, so I thought it would be fun if we did it in here. Obviously there's some time to go yet, but as there are ten sides in the WC, as opposed to two in the Ashes, it could be a very interesting thread.
And just to get things going, I'll make my own outrageous offer (see my avatar/signature to see how my last bets went!):
If England do not reach the semis, I will have my avatar showing ANYTHING, to be chosen by the first Australian to respond to this thread
Generous offer if you ask me.