I suggest you send an e-mail to Disney World using their "contact us" link: https://disneyworld.disney.go.com/contact/ I have sent in a few off the wall (not literally on the wall, like you) questions to them over the years and when they can answer they do. I asked about the brand and style of mattress at CSR and brand of fertilizer at another of the resorts. They were very helpful. I'm sure that there are plans somewhere with the wall color noted, but it might be proprietary to WDW and they won't give it out. Good luck in your hunt.