Fun with packing materials
Jed was talking about styrofoam peanuts, so I feel I should add this:
We recently got some package or other which was extensively padded, not with peanuts, but with those sheets of connected paperback-sized transparent plastic air balloons. They're quite tough -- you can't pop them like you can bubblewrap -- and, having a martha stewart/geek moment, I constructed a matress for Aviva (who thought they were really cool) by taping them down onto a big sheet torn from a roll of drawing paper.
Aviva -- who insists on sleeping on the floor in a pile of blankets, resolutely enough that we have gone ahead and put her bed in the attic -- is now sleeping on this creation. It's very comfy.