Tile helps you find things.
The Travelling Salesman Problem is a classic – I wonder if they use it to route Police helicopters in Hackney? Or patroll cars? Or Bobbies on the Beat? If they exist any more that is. Perhaps super criminals could use a series of spurious emergency calls to drag the network of Police officers away from an area of the city that they wanted to wreak havoc in.
There are many face recognition applications out there, but what about using them for false positives? Deliberately making an app to look for faces where there are none? In clouds or walls or hills? I’ve always wanted an augmented reality application that strips my world back to all the vertical lines, all the horizontal ones, all the circles or all the squares.