There are various ways to avoid the big-blank-wall syndrome on different builds (Ships can suffer from it, Castles are prone to it, and some buildings for Town see it, too). I like to look at different ways to avoid that, and we’ve had some pretty fancy stuff here before.
Sometimes, though, simple is just fine.
Issac Synder has posted this lovely gatehouse, and the walls of the gate are simple but effective. I think it gives overall character to the build!