A big thanks to Risus for the plugging Citymorphs in the Geomorph Roundup. Here's four more:
Too many orderly streets makes the morphians walk in straight lines, they need to feel the wind in their hair and wet grass under their toes.
Every old city will have seen it's fair share of war and it's ruler may have built some sort of defensive wall for the people to hide behind. Notice the groundworks to elevate this section and the set of stairs to get those archers up high.
A straight section of citywall this time. When laying this tile make sure you've built the stairs and earthworks on the same side otherwise the siege will be over in minutes.
The wall needed some way of keeping the riffraff out but allowing the townsfolk in, so here's a useful gatehouse.