Possibly the smallest garden I have done for quite a while this was basically a corridor behind a converted Chapel. We found a way to make it a bit bigger and covered up the grotty fences with a neat green wall arrangement.
Green walls look great but, word of warning, they are quite high maintenance as they need just the right amount of water and are susceptible to vine weevils etc but, in a small garden, they pack quite a punch.
There is also a raised terrace that takes advantage of the only long view this tiny garden has and a strip of planted gravel along the front that amuses the locals.
Hopefully the previously incumbent Methodists are also happy.