cloud_lattice

This is a super handy rig type that you can quite liberally just sort of put all over your character to create very simple and very arbitrary lattice set-ups. Lattices are a really powerful, flexible and cheap way of mesh deformation, that can work really well in cooperation with armature deformation, or any other kind of deformation.

I cannot tell you the amount of times we ran into a deformation problem during the production of Sprite Fright, and the solution was "Let's just add a lattice." After about 6 instances of this happening, I implemented this rig type, and after that, adding a lattice setup took less than a minute.

You can get a written description of this rig type on the wiki.