Password "Gesture" with Mouse

Just now I had to jigle the mouse back and forth to wake my computer up from its screensaver. Being a safety-conscience person, my computer will only wake up to a password. While I was logging in, I thought that maybe a simple gesture or pattern of movements with the mouse might be easier, faster, and safer than memorizing a password, at least for tasks which require only a little bit of security.

With drawing tablets, it would even be possible to simply sign your name to acess a computer. This gesture, signature, "electronic handshake," or whatever you want to call it, could also be added to other security measures such as passwords or biometrics. The only downsite is that some people might try to watch you and "forge" your gesture, just as some poeple try to decipher passwords by watching someone typing.