http://img713.imageshack.us/i/mgescreenshot29.jpg/
I've been reworking the stock mudpots to look more like real ones, or at least to better fit the geothermal areas in my mod.
I've replaced the rolling action with a subtle two-part bubbling action. The first is a gentle overall bubble, where the entire surface rises slightly. The surface has a funky alpha setting to make it look like a residue on the surface of the mud. The second part is a modified version of Korana's soup bubbles - but with mud.
Combined with the sound effect, it's pretty decent. I do need to tweak the particle emitters, though.