Such a simple thing – a door stop.  Funny enough, I once had a client who asked me where to find a nice door stop.  I sort of drew a blank then thought that would make a great innovative product design to invent a cool looking door stop.  Coincidentally, there’s Stoppy. Stoppy is a fun and decorative window and door stop that comes in an array of colors that grips all surfaces.  No more tripping over a big heavy object holding open a door.  (Available at Bed Bath & Beyond.)