Cool Sounds:
If you have a guitar without a locking nut and without a string tree on the third string, pluck the third string behind the nut with the whammy bar pressed down. Raise the bar slowly to produce a nice roller coaster shriek. (Lots of distortion never hurts here).
If you have a remote control laying around, point it at your pickups and press any button. This makes a very neat radar-like sound. Try manipulating this sound with different pedals like a wah pedal or a whammy pedal.
Have fun and knock yourselves out!
KB