I've seen quite a few AI pie in the Face clips and pics and I'm surprisingly impressed.
Is there an app or website that we can make our own with pics?

Is there an app or website where one could take a pic and have it "pied"

There's been some discussion of that in the AI group here, some of it by me. I've tried Whisk with mixed results.

Did the girl in the image give you permission to use her likeness. If not, really not cool.