This is a snow globe for the iPhone and iPod Touch that I developed during my spare time. I began working on it in August(!) and finished it just before Thanksgiving.
The biggest challenge was making the snow bounce around in an exciting way. A real snow globe filled with water moves much more slowly than this, but I wanted to take advantage of the fact that a software snowglobe does not have the same restrictions.
The other big challenge was optimizing the performance so that the snowglobe runs at 60 frames per second.