They had a tiny budget to make this happen.
They took two 4×8 white Coroplast sheets (leftover from tower construction) and traced “Peace on earth” and “Joy to the world” using an old overhead style projector. Then they cut out the letters and stapled them to some scrap 2×6’s. They painted them black to match the wall. (paint was also leftover)
Then they went to Walmart and bought 25 boxes of white and clear Christmas lights and a bunch of Christmas extension cords.
They measured 12″ between each strand of lights and put a drywall screw at the top and then the bottom. They strung up the lights, adjusted their floor LED cans, and boom it was Christmas!