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With enough distance or with good control of all the light, the background color does not matter much as mentioned above. But it can help a lot to have a plain black background cloth rather than a wall with complex stuff showing. The idea of a king sized black bed sheet from Walmart is a good one. The last time I bought them there, you could buy just the top sheet, and did not need to buy a set. The one edge has a wide hem that can be opened up at each end, and you can then put a support tube or even a rope through there. For not too much money, you can have an improvised cloth background, and a black and fairly flat one is easier to keep black than a lighter colored complex one.