Quicksand Fans

And to think that I threw out all my Barbie dolls. Crap!

https://www.youtube.com/shorts/Ys9IdjXY-dg

The green thing is weird. But ok, how about space suit Barbie on an alien planet?

Applying Powdercoat......That is a really cool real world use for a fluidized sand bed.

You could change out the media to something more granular (and less dangerous from a respiratory perspective) and colored brown. I don't know if you'd still get the bubbling effect with coarser materials though.