You don't necessarily have to adopt a black cat to help one. Try fostering for one for the holidays! This way the cat can socialize in a home environment and and gets the love it deserves. If you aren't able to bring a pet into your home, go to your local animal shelter and volunteer.
In case I haven't made it clear, I am a HUGE cat person. I am convinced that when I get old I'm going to be one of those creepy cat ladies that never gets married.