There's a cardboard box under my worktable. It's got failed joints, pieces that warped wrong, a glass bottle I spent three days cutting that finally just shattered. Also a few things that worked fine but I hated anyway.

Before I start anything new I pull it out and go through it. Not for inspiration. More like a reminder that most of what you make is going to end up wrong or abandoned or just okay. Clears the head somehow. I don't try again with the same stuff, I just touch the failures and then I'm ready to make new ones.