One I can think of off the top of my head is Syd Segal's "Thank You LePaul" effect from his book, Full Metal Jacket.
But if you think about it, the For4For has endless possibilites for applications. Really any trick that uses a single or multiple card-switch from the top of the deck will work, right? I don't quite understand the meaning behind this topic, unless you're after more than just a switch?
Take care,
Jordan