>Green: white or yellow envelopes that are jealous of the blues
>Grey: users over 65
>Bronze: consultants making over 100,000 US per year
>Silver: consultants making over 500,000 US per year
>Gold: consultants making over 1,000,000 US per year
>Black: stealth users
>Red: shy or easily embarassed users
>Purple: reserved for Barney and Elmo

All right on the spot except:

Purple: reserved for The Limo.