Rejoice, for I have discovered a loophole for doing better than acquiring the Goo Baby graphics. I just used the _MyHue variable to simulate them. That seems to be basically how they were made for the original joke video anyway. It's better because custom graphics can only handle two animation frames if you're having the animation time be random. But the base graphics have three states, and also a number takes up less memory than an image.
Here's the values I used for my test;
Tar - 3000
Mud - 5000
Gel - 1000
I also have another gift that I rotoscoped myself. The shared tiles of Chief Drokkendutt, and Old Rarsus. Sadly limited to only facing south.
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The internet is no place to act like a wild animal.