I'm somewhat of a pack-rat when it comes to materials and refuse to throw out the smallest scraps, telling myself "I may need that later". My son has been sitting on a milk crate since I finished his 3/4 scale machine and because I couldn't find a suitable stool or chair for him, I decided to build one myself.
All from scrap materials (except the black t-molding which was bought for a separate project) and a couple of days work. It's not perfect as I pretty much made it up as I went along but I think it came out ok.