»Blue and green meanings?«

Has anybody noticed how the title "The Matrix" on the DVD case has a bluish background to the letters, whereas the title "The Matrix Reloaded" has a green background? It has been said before that scenes taking place within the matrix have a green tinge to them, while scenes in the real world are somewhat blue. I wonder if this difference on the DVD cases represents something. Furthermore, I wonder what colour "Revolutions" will show?