if only this existed back in Van Halen's heyday http://en.wikipedia.org/wiki/Van_Halen#Contract_riders
"This American Life" did a great segment explaining (as does your wikipedia link) why the M&M's were a legit safety concern--and not just a prima-donna move by self-indulgent rock stars: http://www.thisamericanlife.org/radio-archives/episode/386/t...
The point wasn't to have red M&Ms, though they taste good, it was a test to see how well the crew followed instructions.