Gold and Elixir Refund/Full Customization
There should be an option to downgrade walls, barracks, collectors, army camps, defenses, etc in order to get your Gold/Elixir back so you then can use that Gold/Elixir to upgrade other things. It's basically like a complete new way to customize your base. Also be able to completely downgrade everything to start over and just upgrade what you need to in order to make a completely new base without the wait time of building things unless you haven't reached that level for that object. For example: Say your cannon was level 10 before you downgraded, you wouldn't be able to upgrade to 11 unless you waited the amount of days required for it to be level 11. Example on how I would use this new idea: I would downgrade my walls and use that gold to buy inferno towers. Makes my base weaker but also stronger at the same time. It would revolutionize the way people customize their bases, and people LOVE TO CUSTOMIZE! Also you couldn't do this all the time. You could only do it once a week so that way it can't be abused.