Is there any way to change the background color for pictures?

[historyfinder]

My eBay listings have light blue backgrounds. I'm posting black & white baseball cards. They look washed out or blend in with the eBay light blue color background. Is there any way to change the color?

[brightlightbookseller]

Take them on whatever color background you prefer.  Don't remove the background.

Note: Google search seems to prefer white backgrounds.

[historyfinder]

I scan them and trim them. But when they're listed, eBay or ? fills in the space surrounding the card with a light blue background. I'm trying to change it to a white background.