You could have sewn them onto a jacket and had a 70's dance outfit...would have been awesome
If you lived in Boksburg or Chatsworth you could built them into your windscreen washers/valvecaps/exhaust tip/windscreen wipers/aerial/ fog lights/air vents and of course door locks.
As a more practical solution, have you thought about building a BS detector?
Could be linked to a switch in your sleeve, so you can make it shine when someone's talking BS...like now for instance
![Very Happy :D](./images/smilies/icon_biggrin.gif)
:P