ok here's some sensible options......ahem
Mount a large lightbox on the wall and get some x-rays done and put them up
Or decorate it something similar to a big bank job plan.....blue prints from local planning offices and just label at the top Barclays on the highstreet
Perhaps something out of Seven like the Detective's wall with all the evidence mounting up, maybe something out of The Wire
Band of Brothers....well you could turn your room into a scene from Bastogne and sleep in a fox hole
what about making your own version of the tube map....wouldnt be too difficult. Get some stencils made, bit of masking tape...the stations could be all the decent pubs and how best to plan a local pub crawl etc