We all remember Glass Wax, don't we? It was a liquid solution with a pinkish white cast that came in a bright pink metal container. You shook it up, then applied it to your windows and let it dry. It dried to a white hardness, then you polished it off. (I always thought it was made by Johnson's Wax, but it wasn't. The company was Gold Seal.)
Some bright person realized that this whiteness could be used for another purpose and voila, Glass Wax stencils were born. These were made of waxed paper in all sorts of Christmasy motifs: Santa in his sleigh and also coming down the chimney, reindeer, bells, angels, snowflakes, a nativity scene complete with a shepherd and Wise Men with camels. You applied the Glass Wax with a dry sponge and presto, your windows were festive. Then when Christmas was over, you wiped off the stenciling and the windows were also clean. It was a decoration any mother would love. If you were really ambitious, you could add a few drops of food coloring to the liquid Glass Wax and have multicolor festiveness.
We had a big glass window in the living room, horizontally sectioned into four long panes. I used to decorate the entire window every Christmas. The third level would be the Nativity scene. I would reuse the Wise Man and camel motif carefully three times so there were three, not one; and make one pair of reindeer into eight (in fact I would then dab the sponge on only one of the reindeer and make Rudolph at the front, using the edge of the sponge to make "beams" of light from his nose. Santa and the deer were on the second pane down; the top pane had the star and banks of angels on either side, ringing bells or playing trumpets (the angels only came with bells; instead I improvised the trumpets from the edge of the sponge). The lowest level was reserved for the miscellaneous motifs: bells, holly, Santa in the chimney. It was a lot of fun.