Some images are missing and some need updating, and this work has started already. But if anyone likes to participate, go ahead and post. Please keep in mind that you should use official press images and logos of a simulator whenever possible, and do not make any new logos.
Example image here is of Assetto Corsa. Logo on top portion, and a great image in the middle, seems to work the best. Resolution preferrably 1024x768 or more, but the aspect ratio does not need to be exact.