A Case of Murder...

A group of crows is called a murder, muster or storytelling of crows. The most widely used term is "murder."
This is based on the (fallacious) folk tale that crows form tribunals to judge and punish the bad behavior of a member of the flock. If the verdict goes against the defendant, that bird is killed (murdered) by the flock. The basis in fact is probably that occasionally crows will kill a dying crow who doesn't belong in their territory or much more commonly feed on carcasses of dead crows.

On a lighter note...Joyworks has a nice selection of crows!
and...
I'm having fun with my new flower that I made out of an old wool blanket.