World map. I got a 4x8 sheet of half-inch plywood cut into thirds at Home Depot to end up with 3 pieces of 32x48" -- a good size to fill the empty wall in the dining room. With one-inch spacing, it gave me 32x48 pixels. I scaled down a world map to that size and posterized it to 5 colors (white + 4 shades of gray).
DIY ARTWORK for repurposing old maps. This one is a new one! What a great idea. Pick the image that you like best, stencil or trace it on the piece of paper and cover the map. For example, the Eiffel Tower traced over a map of Paris!