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Those waldos are stunning! And those photo boxes are nice too, eh?

If you want to change your backgrounds later, see if the fabric store has any neons, like green, blue or orange . You could work with basic black or white, but it's much more primitive and inaccurate a technique that way (especially with a white and black pod!) Of course, if you want proper 'product shot' imagery, black and white is the only way to go.

Typically, you swap out your BG color for whichever color is not in your subject. You don't want to use a blue screen if your subject is wearing blue jeans fighting the Cookie Monster, for example. You want green or orange in that case. As neons are unnatural, they simply make it that much easier. (Technically, you'd be looking for Chroma Blue or Chroma Green (paint=$50+/gallon!)

So, this will allow you to easily pull a key (magic wand/color range) and add a background of your choice later.There are additional tricks to lighting the green separate from the subject, but for this level of work, you should have few problems. You will also have to deal with color spill (light bounced back onto the subject from the walls), but that is easy enough with the Hue/Sat controls in PShop.

Art stores (even your local grocery store in the kid's supplies/art section) have 2x3 foot sheets of neon green as well. You get some sheen off them, but that happens with fabric as well.

And if you want to take a video of your model and composite in a moving background later (AfterEffects, Combustion, etc), simply put regularly spaced, little dots of the contrasting color on the walls and you can use them as tracking markers! (Green gets red dots, blue gets orange, etc)