These are some animations I did for a huge Microsoft Halloween party when I was up in Seattle. They wanted a scene of a gate/garden in the country to have plants grow, then for the scene to transform into a Halloween scene. The animations were projected onto a 90 foot wide wall (HUGE) and were looped. When the Halloween animation was shown the lights were turned down and the party got crazy. I made animations to transition between the two but I'll spare you.
Skip to a ways in on the "happy" scene if you get bored, it undergoes quite the change. You can also turn on HD if you please.