Thanks, WD45!
Wasn't there an Halloween episode of the Simpsons where Willie turned into a tractor or something? I'm thinking of the Nightmare on Elmstreet parody.
Couw, I do the same thing as you. I just lower the number of colors of the .gif. When I was doing a lot of animations, I was getting down to 32 colors often.
That's a good idea about changing the background so it won't be so many colors.