When painting the Death Guard minis I was a bit more cautious than on the Poxwalkers. Technically Space Marines are generally a lot more forgiving than any other models of course (they're basically like painting tanks or cars), but still - I wanted to get a nice look.
For some reason I really like white-ish/bright Nurgle models, the reason being that these colours you can mess up at will and throw on lots of fun effects. The thing is hitting the balance between looking dirty and icky, but still having well-defined details and outlines. Above you can see a WIP shot of the first Death Guard Marine. Seems to work out OK.