I love this idea. I would do it, get removable wall paper. - "A neighbour of mine has one wall in their house papered like this. Every time a new guest comes in, they are asked to colour-in a character and initial it.
Possible patterned "Master Closet Doors" customized. DIY Painted Pattern Furniture Makeover with Furniture Stencils - Decorated Custom Wood Cabinet Doors - Modern Mid Century - Tribal Batik Design - Royal Design Studio Stencils