Latest car like mod

Well since I had an air filter idea from a car I decided to go to the next level and add an ignition style switch.  After some research I found a momentary on rotating key switch that was of descent size.  Using the modders best friend (a dremel tool) I inserted the switch and hooked up the wire.  Polarity doesn't really matter 'cause all your doing is closing a circuit to send I signal to switch on the power supply.  Now if someone wants to use my computer they'll have to hotwire it.  j/k security wasn't the issue I just wanted something diffrent.  Now I have only two questions left.  What do I mod next (for basically no money)?? And what kinda key ring should I use????