Algodoo

The object in this scene is a polygon, and this code ONLY WORKS FOR POLYGONS.

This scene can create a bounding box for any polygon, as long as it is very simple. (This limit exists because the code uses normal for loops.)
This works by finding the furthest +X, -X, +Y, and -Y points, then using those points to make another polygon in the shape of a box.
This could be a bit useful for mouseOver checks on polygons or something.

Another scene coming a bit after this!

Edit: Positioning doesn't work well for concave polygons.