I found this if you guys are still interested:
10 Collective Nouns You Don't Know | Words You Don't Know
It's really interesting the logic that is used for them. Like the nun one.

I also found out that a group of monks is called an abominable sight

The video at the bottom of that article, of the starling murmuring, was creepy at all heck!

@ cardinal - That was a really interesting article about collective nouns. Thanks for sharing that. I actually was wondering what a flock of unicorns were called. The noun is fitting