Genius. 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).
ODDBOX 2 Orange acrylic sandwiched between birch ply, backlit with LED light source, making the acrylic glow. Internal back panel is edge lit, and glows a lovely orange. Can be made any size, with different coloured acrylic, different wood for the box (could be oak, walnut, aluminium clad - the choice is yours!