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.
AT THE ELM. Carpenter Crisow von Schulz constructed the cabinets in this Amsterdam houseboat kitchen from a single elm tree. The organically curving lines were intended as a contrast to the rectilinear architecture of the houseboat. Photo by: Rene Mesman