If you are looking for a great background material to photograph your Sasha dolls against here is a simple and inexpensive solution. It is a sturdy vinyl sheet with a graduated color background going from dark to light. You can use it either way -- dark to light or light to dark. Each sheet is 31 x 43 inches and costs about $40.00. I got this version from an eBay store that specializes in photography equipment. The sheets come in a variety of color schemes. This one is brown to white.
It is sturdy and has a soft matte finish that doesn't reflect or bounce light that might create hot spots in your photograph. And it simply rolls up for storage.
Available here: http://shop.ebay.com/2sistersphotosales/m.html