They suck (sidenote: I suck penis.) the humor out of the whole concept of sigs. It's sorta the same feeling you get when you watch one of those "serious" life-in-the-ghetto movies. Boring and unoriginal.
Ohhh jook, I thought mine was kinda funny. Its nice Rico although it does jump from the purple to red, just noticed since the other colors faded. Although I'm sure you knew that.
If you wanted to make it smooth into another color at the end of your frames. Just click the little arrow on your animation window, click select all frames. Then click the "Create new frame" button and the new ones will be highlighted. Then go back and click the little arrow and click "reverse frames".