PlantUML’s default color scheme it’s own. C4-PlantUML removes the PlantUML-ness nicely.
My only pet peeve is about C4’s terminology. Most of diagrams I write are somewhat related to Linux containers. So “containers” in my diagrams must mean “Linux containers”, whereas it means a lot of different things in the C4 model.
Not Docker! In the C4 model, a container represents an application or a data store. A container is something that needs to be running in order for the overall software system to work.
That really doesn’t work for me, sadly.