you're up against it really, locks are what they are and the good ideas on shape and current materials have been done. smaller ones, ones with integrated cables, ones with alarms, really not sure what you'll innovate. the only thing that I can't recall seeing is one that fires a dye over the thief, cash in transit security box type thing that ruins the money and doesn't readily come off a person, but you'd need it to be sure not to go off on some poor innocent parking their bike a bit roughly next door and you'd need it so it'd come off the bike without leaving a trace whilst sticking all over the thief, until you blind them with powder or get one with skin allergies and you kill them invadvertantly.