I've read that the new, larger 2.5" LCD's being used in Canons newest cameras like the 5D, 30D and 1D MkIIN all have a bit of a green/cyan tint, may be caused by anti reflection coating or something.
I can see it a bit on my new 1D2N, but it's not bothersome to me since I dont use the LCD to judge colour, only exposure (histogram) and composition