The backgrounds are actually the ones that are displayed here, however, I typically modify the color scheme of the background to best suit the player's ship and toon. Occasionally, I might also layer two different backgrounds, depending on the signature that I'm working with.
What allows me to run the store for such a low cost per signature, is having all the parts pre-fabricated, so to speak. Each background is already sized properly and formatted accordingly, so that I can put the pieces together rapidly, but still provide a product that looks good for which the energy credit return is worth the time investment.
For that reason, I typically don't accept custom orders, but I'm sure I can whip up something that you'll like :)
Dave.