Blender Tutorial: Pot O' Gold

Top o' the mornin' to you! Happy St. Patty's Day from Animation for All, and in the spirit of the occasion, we'll be making an animated scene featuring a pot o' gold at the end of a rainbow.  In this scene we'll be using the following methods to get the final result:
Modeling the objects, meaning the pot, the gold, and the rainbow.
Adding special effects through animated textures, materials, and compositing on the final render.
Setting up a particle system and having it follow the rainbow object.
Stay tuned toward the end of the tutorial to see how the particle system was set up, and let me know your thoughts on how it was done, and perhaps how you might have done it.  Leave feedback in the comments section below.  Thanks!