I salvaged some foam from work that I might use to make a headboard for my bed.
It’s four 70x50x3cm pieces of firm foam, and two 70x33x3cm pieces of softer foam. I want a headboard that is at least 140x80cm so I guess I could just use two firm ones on the bottom and two softer ones on top. Then the two remaining firm ones could make a ~120x50cm back pillow for my bean bag sofa. I think I have enough felt material for both projects.
I have zero upholstery experience though, so I guess I should do some research first.