Don't know if it'd qualify as "cool", but the most useful thing I've made is a chicken coop and run https://antipaucity.com/2021/11/19/the-coop-with-lots-of-in

Don't know if it'd qualify as "cool", but the most useful thing I've made is a chicken coop and run https://antipaucity.com/2021/11/19/the-coop-with-lots-of-in-progress-pictures/ https://antipaucity.com/2021/11/19/the-coop-with-lots-of-in-...