Here are two of my favorites, I hope they qualify...I can't wait to see what other people will post.
"A veritable cornucopia of knowledge"
"A panacea of cure-alls in medicine"
Oh and "plethora" seems to be quite popular now too in collective nouns, but unfortunately I can't think of any right now using it!
I didn't make them up but I use them sarcastically for laughs.
[edit on 25-5-2008 by LateApexer313]
[edit on 25-5-2008 by LateApexer313]

