These are pretty great:
The Ninja Coat Hooks will transform your hallway into the scene of a Shanghai back street stand-off. Each metal Ninja Coat Hook has one corner cleverly engineered into a screw, which allows you to fix securely to your wall or door, whilst making it look like it has been hurled from the hands of a deadly Ninjitsu assassin.
Not sure if I believe the site’s claims that they are “completely coat friendly” (having personally torn fabric on far less weapon-like objects), but still…
SheWalksSoftly 