this would be a pretty cool trick to show in a future episode.

in the mean time, here's what i've done before to create cushions:

using the sandbox tools, create a contour from scratch and then use the smoove tool to effect the surface to give it a pillow-esque sort of an undulation.

then make the contour a component, copy it, and flip the copy upside down.

the 2 surfaces will probably not meet up perfectly at the edges so at that point you have 2 options:

- go into the component and use the move tool to move the edges together until they touch. 

- overlap the components and then use intersect with model to define the intersecting edge and delete the parts that overlap.

let me know if there are any aspects that you'd like for me to elaborate on.

-mike