Some half useful tips here. But we are getting somewhere ...
For original book: iPad 2: Creative Learning From The Beginning
For second ebooklet: 21 Creative Uses for iPad 2
Here are few sections from chapter 11 (the second booklet). Tell me what you think (not proofread of course, so pardon my Engrish):
Chapter 11: Creative Use of iPad
iPad owners must be able to think outside the box. This, at times very amusing chapter, full of useful tips, serves to that purpose. But mind you, for most of them you will have to install specific app and not all mentioned in here are free.
Flashlight
Select very bright background for your desktop, then set brightness to the maximum. Voila. Instant LED flashlight. However, you can also help yourself with apps, that show only bright white screen (other colors are also supported): 1-Click Flashlight, Free Light Flashlight... Those more ambitious applications can have a whole array of lightning tricks – from ordinary light bulb imitation to stroboscope blinking (home disco!). Some can even be turned on with clapping. If that does not leave an impression...
Metal Detector
Magnetic field detector can not only be used for compass, but also to detect metal. Again, there are several applications that can do that: Metal Detector, iTesla, Real Metal Detector. But you do not even need app for that. Just fling few paperclips on the center of iPad's screen then gently tilt it to the right. There it is. Magnetic field detector is magnet for itself. Just do not ask me how do they work.
Cat Toy
If you think that you are having fun using iPad, then try it on your cat. Fun for both guaranteed. Do not worry, it will not scratch the screen or even broke it, unless you own an ocelot. Cat Toys Lite and Expensive Cat Toy apps are simulating mouse and other vermin (in non-free version) in a box. If you believe that your kitty is artistically gifted, then reward it with Paint for Cats, so it can paint without annoying stains on the paws.
Dog Whistle
Dog lovers can also find a lot of dog specific applications. Especially for those ones, who does not now how to whistle. Whistler Dog, Dog Whistle Trainer, Ultrasound Whistle can simulate whistling. You can combine and test different pitches, even inaudible (to human ear) ones.
Although on 2nd thoughts, that sounds sucky as well. 
