The guide on how to create these yourself can be found here.
I’ve decided to temporarily open requests again. Go here to make your request.
Any future DDS files will also be added to the Facebook page.
Anyone who no longer wants to use custom pictures and forgot to backup their mpq can download the defaults for Terran, Zerg, Toss, Random and main menu here. These files are in .DDS format, so you’re still going to need to MPQEditor to replace them.