I love metaballs and the surfaces they generate since I used them in Povray. For this animation I used them to render the particles of a particle system. Works really good and is very cool because the particles also interact with other meta-objects of the scene. A really cool way to model slime, brains or similar stuff.
as usual you can download the blend file here
bend and twist part 4
icosphere deformation part 2
bend and twist - part 2