nice edit... hurry up and get a back ground so we can TOM this sucker...
I really think you should try some solid colors (and black) before resolving to a picture. ... not that a picture isnt nice... just your set up is so simple and rockin that a solid color would be best IMO... perhaps if the pet store has something that goes from dark to light blue that would be cool... but a pic would take away from the simple beauty that is already there ...