so you know the item bank in town hall? what if there was a way for you to upgrade your storage amount inside of them.
by adding something like green or purple crystals. like alot of em. you can increase the size of your item bank in the town hall from 6 to 8. and so on. the cost of crystals increasing each time. with a storage slot upgrade limit of possibly 18. this would be extremely handy, and it will give a use to green/purple crystals