I think it depends on what your goals are, especially the mood you're trying to convey.
Also, it depends on the scale. If your still life is human scale, you may want a photo backdrop because they don't have seams. I've used aluminium foil taped together to photograph kitchen gadgets.
You can always use darkness as a backdrop. For example: clear out your garage, put your subject on one side, put your camera between the subject and the wall, then aim for the dark emptiness. (Of course, only light the subject). This is the blackest, cheapest backdrop of all.