Nurgle is almost a god of family, true love, and compassion as much as he is of rot, disease and decay. His great daemons are known for freaking the fuck out when anyone thinks of attacking their "children".
I'd like to picture his followerings having grand weddings. Sickly green everywhere. And as the bride and groom leave the alter of nurgle after a great "Uncle" one marry's them, one of the bridesmaids would whisper.>"You see how she's wearing off sick-green. She used to be a slaneeshi worshipper before she met him.">"That man's too good for her sister!">"Mmmm-hmmmm">Then she snaps a few times and her fingers break off.