Blendshapes, blendshapes. Something only a programmer could love.

Create the base shape object... whatever head or whatever. Click create blendshape. There is a window under animation editors that is the blendshape editor. Now, click create blendshape, model the blendshape, and click create again, model the next... whatever. Now you have to name the additional blendshapes. Then those things will influence the origional object.