Style Not Substance

Sorry, I'm later than I intended to be. It's very hard to get things done when one has houseguests.
The results of Challenge #6: Shadow on the Wall are:
( results )
Thank you, everyone!

I've also revealed the entries in the challenge entry post.

Now, discuss! How, why, when, where, what...?

Yes, we are here again, after our break! Welcome to the sixth challenge: "Shadow on the Wall". For this challenge you must create a silhouette, that is, an outline of an image without details inside, as if it were the shadow of something. Or more than one, of course.

This challenge is now CLOSED!
The entries are now revealed.
( more and rules and dates )
In short:
Due 18th January, post entries here, don't show them elsewhere.

If you know any good tutorials for this challenge, please post a link.

And please pimp this far and wide!