Originally Posted by cur
Friend who works for Canada Border Services says this:
"green is the US travel document, it's for non-us citizens and is issued as a TRAVEL DOCUMENT. often for perm resident holders, and supplements the holders passport for admittance into canada
blue is standard tourist us passport
burgandy is diplomat and official state business"
It sounds more like your friend is referring to a green card, rather than a passport...since it says "supplements the holder's passport for admittance into canada"