We've got a free art exchange box on main street in town. Always fun to see what's in there. Never empty and always different. Maybe it's from reading Capitalism by Beckert, but libraries, art exchanges, fix it parties, and other GNP lowering activity really feels awesome.
I don't know if Little Free Libraries are whimsical enough, but they were discussed recently: https://news.ycombinator.com/item?id=47211280