Having thin shards of sharp plastic - read propellers - spinning fast with people around is the recipe for injury and trouble. Probably your best bet would be a Parrot.
I know it's not tiny, but at least it's safer then a diy solution. And even then you'll stand the chance of finding someone with less then average brains trying to stick a finger into a propeller arc.
I've had a motor failure on a hexa while recording an event, and I was struggling to land it in one piece, when people suddenly noticed my suddenly-not-so-smooth-flying machine and started moving towards the spot I chose to land instead of backing away.
Some were thinking adding a miniature camera (I think from Range Video) to a Walkera Ladybird.
There is something like that already in production I think it is around $150