This Again.
OKAY well you can buy blank white playmats from EBAY.
Putting the stuff on is up to you. Mind you to keep copyright in mind cause this is a grey area on here.
I know there were some web sites that allow you to upload custom images, do you happen to have any links?
I don't have a playmat handy to measure at the moment, but are those measurements from Pokemon mats, or standard mats? Pokemon ones seem to run a bit small and I can't stand it tbh. If those are Pokemon-sized measurements I'd try and get a YGO player to do it or something.