Hello. Actually, changing the color is not a big deal, if you choose my design I am absolutely available to make all the changes you ask me for. When choosing a winner, you will receive the a JGP and ESP file of the image, which are completely editable. I am quite sure that you guys, -as "the client"-, are able to activate an option that makes possible for any contestant you like to keep uploading more images with all the requirements you need. Otherwise, I can change the color and send it to you via email. I hope this has been helpful.
Regards