I think they make giant stickers. I know they do for dishwashers to change the look.
Are you looking to do a custom DIY paint job or are you looking for a skin?
Here’s a link to skins that you can purchase. Hope this helps!
You will need to surface sand the fridge so that the paint will adhere. Clean it real well to get off any dust or dirt so that you get a smooth surface. There is paint for appliances you can get at home improvement stores, just ask an associate in the paint department to help you get the one you need for the best results.