Just read this article, it was pretty good. They have some pictures of Custom mavericks if you need ideas.
https://www.thedrive.com/news/the-ford-mavericks-of-sema-could-kick-off-a-new-mini-truck-craze
As far as CUSTOM (i.e. your own design), I have not see this with older ford models. I have not messed with the Maverick yet, But on my 2013 F-150 and 2017 Mustang, I was only able to change the splash screen to other pre-loaded images, like the Mustang GT, RS, ST, Etc... If a way was figured...