When the idea came to me for the intro I knew I had to write it down as soon as possible. So I opened up a text document and wrote down the steps I wanted to see in the intro. I had already made the channel art so I wanted the and of the animation to lead into that. At the bottom you can see the hexadecimal for the color I wanted as the background.
I actually drew these little pictures in Flash and they didn't turn out too bad. It helped me get a general idea of what movements to do when.
I then moved to Photoshop and started making the assets I would use animate in Motion.