Thank you for your insights. White it is. What is a little seasonal painting here and there? The whole floor is 24 feet long so I could pull back if needed. Mostly I am interested in providing images for new owners or of dogs and ribbons fresh from the ring. The other intended use is as a site to explore macro and stills.
Backdrops: I've planned on black, white and green chromakey. Ambient colours are the question no longer.
Again, thank you.