For April Fools day I think reddit came up with a pretty fun idea. 1,000 x 1,000 pixel blank canvas that redditors could each “place” a pixel on once every 5-10 minutes (cooldown time varied over the 72 hours that this was open). You could place on a blank space, or even overwrite a previous redditors “place”. There were battles waged and wars won and lost throughout the 72 hours that it was active. A lot of creativity, but in the end mostly bots controlling the early established designs already in place. It was pretty amusing to check in on a few times a day.
Pokemon were prevalent throughout and I placed a dozen or so colors over the previous 72 hours. All in defense of Pokemon, my alma mater, and the American flag.
I personally helped with /r/Cubers. This was the end result:
Even though we managed to make a 1x1x1 and 2x2x2 in the end as well, the r/Cubers has been changed to r/Bubers… Ah well, we tried.
And thanks for the video link. Rofl at Germany taking over the French flag, forcing them to move above it… EDIT: @miraclegro already said this apparently.