Made them using a premade .PSD from Pixeden. If you have Photoshop it's easy to replace the placeholder images by double clicking and editing the PSB file within. You can also choose your own background color.
This specific template has a very high resolution, so I advice you to scale it down a lot before starting editing, or your computer might blow up.
I think the approximate aspect ratio for the library images is 1*1.84.
Hopefully this inspires someone to try it out with their own shows