My wallets over the last few years. You can really see the progression in DIY effort. From realising clear tape help them last longer to figuring out it's easy to print your own stickers. The first few ones aren't even dated. That started with the one my daughter decorated when she was three.
I keep switching for new designs but these last a really long time. Before I made a new one today I had had my last one for a bit over seven months and it's as good as it was after a week.