I believe one of the original collective nouns was an "exaultation of larks" along with the "leep of leopards."

Ben Johnson was credited with referring to a group of whores as a "jam of tarts."

You can have a "pride of lions" but not a "pride of politicians."

How about a "foreclosure of mortgage lenders"?

How about a "stave of shanty singers"?

How about a "plethora of plutocrats"?

Cheerily,
Charley Noble