Ahleha,
I think you may have my stuff confused with that of James our moderator. I don't use high-key backgrounds in my work.
If you look at my Rowdy pic that I posted a while back, you'll see that the blue background was draped over a small riser to form both a background and covering for the riser. That background was simply a piece of white muslin purchased at a local JoAnne's fabric store, dyed blue and then crumpled up to form non-linear wrinkles.
I've also purchased some great backdrops online from places like the Backdrop Outlet and Backdrop Warehouse. You can use anything you like to create your own "look". I've even painted my own backdrops -- and they looked like I painted them
. But they filled the need.
Go to a fabric store and see what they have in the bargain bins. You might find something you love.
Jim