Flesh Forge did a simple backdrop

http://www.sharecg.com/v/46973/gallery/11/Poser/Simple-Backdrop-Prop

I tend to make a lot of use of Hellboy's (link provided earlier) prop as well.

Sometimes in real life studios, you will have some high power lights targeted at the backdrop by barn doors to "blow out" the imperfections and creases in the paper and it will show as a perfect white background.

That uses Soto's posing background with a Normal map applied to it.