I went to the dollar store and bought a sheet of blue poster board.
I use C-clamps to hold one edge to the table and then bend it up and clip the top to a bucket of my terrain sand so there isn't a hard seem.
Then I bring in a stand light on one side and clamp a desk lamp to a chair on the other side. Bring both in close.
But the printed backdrops are spiffing. I may use some.
James