Try this: Render the scene exactly how you want it, then choose Display - Paste onto Background. Choose Smooth Shaded from the Document Display bar (this isn't necessary, but it will turn off all textures, making your actual model easier to see), then simply move the camera so only the rendered background is in view. When you save your figure into the library, the thumbnail will show the rendered background. Hope that's of some help. ;) SnowS Hoping his pictures are worth 1001 words.

my DeviantArt page: http://snowsultan.deviantart.com/

 

I do not speak as a representative of DAZ, I speak only as a long-time member here. Be nice (and quit lying about DAZ) and I'll be nice too.