Wow those are all awesome!
When we had to replace our furnace I needed to yank out the wall in front of it. Looking at the space I asked myself "why put drywall back when I can use 3/4 inch ply and tee nuts?"
Wife wasn't amused at first, but the kids love it so she puts up with me haha. Ours is a simple flat 8'wide x 7'tall vertical slab. Perfect for tots and kids.