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.
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Bender Photo Collage - x canvas with blocks of Glue pictures on with Elmers glue leaving a small border between. I nailed the canvas to wall behind random pictures to keep it smooth. We bought "primed" molding to frame it and nailed to wall.