Liz,
like the blue; hate the pink
. The nice thing about backgrounds is that you can find them in some pretty neat places like the discount bin at JoAnn's & Walmart. That's where I got my black background.
For my first one, my partner and I actually hung a muslin sheet outside and attacked it with 5 spray cans of paint to come up with our "artist's backdrop". It worked fine for over 3 years.
Jim