Here is how it's done. Take a cardboard box roughly cube shaped. Mine is about 18" on all sides. Cut out a square window in 3 of the sides, not the bottom of the box. Cover these in white tracing or tissue paper. Cover the inside bottom of the box in white card and what will be the base. You can add whatever color you want to stand your item on each time you set up. You can also create an infinity back drop by taking a piece of unfolded card, taping it to the top of the back panel and to the front of the base panel, bending the card but not folding.
Mine looks very crude but does the job :)