You mention WDW in your post, but posted this on the
Disneyland forum. If you're asking about door decorations at Disneyland in California, you should know that they don't really do that here. It's more a WDW thing. This question gets asked on the boards from time to time and the consensus is that you don't decorate the doors at DLR. I'm not sure what they would do if you did, but I've never seen it done.