Decorating stuff for the holidays takes way too much time. You have to string stuff up and attach this shiny thing to that thing and it blows. That's why the best way to get into the Christmas spirit as fast as possible is with a Christmas Cannon.
The Christmas Cannon is a pneumatic cannon that is loaded with the spirit of Christmas. It is then aimed at something horribly devoid of Christmas-ness and then blasts it with goodness. If even just some of the Christmas-ness is imbued into the target it's a success.
Now, let's get Christmas-y!
Song: "Jingle Bells" by Gary Hoey. WARNING: The people that are shot in the video were shot at very low pressures. Each of the projectiles shot were tested against other objects several times before these shots were done. In normal circumstances, do NOT shoot or aim at people or animals even if you are wearing safety glasses. Be safe.
WARNING: Be sure to do your research before building a pneumatic gun. This cannon is more of a prototype since it was never meant to go to high pressures. Be careful and be safe. Before starting such a project be sure you know exactly what you're going to be doing and not making it up as you go along.