The excellent Pirates in this section reminded me to put a similar project of mine in the showcase: Ghost Pirates!
I put these guys together with the classic Mordheim Undead warband in mind as fallback rules:
Ghost Pirate Captain [count as Vampire]
Three variants of spell casters: Squid Priest, Mermaid, Sea Singer [count as Necromancer]
Ship Dogs [count as Dire Wolfs]
Ghostly Crew [count as Zombies/Ghouls]