Using recycled polyester, nylon or wool fabric to create cloud visuals, with soft sponge in between the fabrics and wood panel base to create more bounce back effects. Texture needs to assemble wadding or soft toy stuffing.
Look at recycled nylon fabric: Patagonia
http://www.patagonia.com/recycled-nylon.html
Recycled architecture and design on Dezeen:
https://www.dezeen.com/tag/recycled/
Test samples can be found on ebay, amazon, or other major online retailers. Quality vary and need to bare in mind the softness and stretchiness. Some do not tend to stick together very well. Photos will follow.