I have a friend who moved into a different house and decided she wanted to redo the dining room. This seemed strange to me since there was so much to do in the house and the dining room was the one room that had recently been painted. The paint job was very good and the color the previous owners chose was neutral, definitely something you could live with for a while.
After she had been in the house for a few weeks, my friend invited me over. The first thing she wanted to show me was the dining room. She had repainted the room and then used ocean maps to cover the lower part of the walls. It looked great. The wall was painted a greenish blue and this matched the color used to represent the water on the maps.
This was the first time I had seen a room done in this way. I don't want to be a copy cat, but I if I could find enough old maps then I think I would try using them as wallpaper in a room to see how it looked.