At the end of the day when you just want to do this:
It can be hard to get comfortable when your cushions are losing their foam firmness, so you put pillows under them like this to make it bearable again:
So we took the cushions to the House of Foam in Palo Alto.
Then after a week, our couch looked normal again, and it now can be described as sitting on a cloud.
For those interested, here is a picture of the foam before and after: