This is an old trick used throughout the ages....... Decoys!
How about the ability to buy a decoy building (any type) and as you get higher in TH's, you have a broader choice of type or number. It would never be a huge number of buildings..... just a few.
- Fake DE Storage? This would reduce successful Zappers!
- Fake Defense? This may draw Giants (or other enemy troops) off in the wrong direction.
- Fake Air Defense? Might make a balloon attacker rethink his strategy.
- etc....
They will be a fraction of hit points the real thing, but will serve their purpose..... cause a little confusion, redirect attackers, etc..