I know that Burberry is so easily ripped off because you can't patent "plaid" even though it is a distinct plaid. That said, I'm going to wager, no, you can't patent a colour. But this is just a guess.

Oh, and the reason the pattern for Louis Vuitton, Chanel, etc. are patented is because they are a logo.

Damn, my mom really ****ed with my head when I was growing up.