My inspiration for creating a pirate theme came from the members here, like Captain Jacksparrow and EvilBob. I thought it would be neat to create my haunt around the fact that a bunch of North Carolina pirates followed us when me moved to Washington State.
My son soon asked to have his birthday party a week before Halloween, with my pirate theme. So from there it has been a couple months of prop building and internet shopping.
I've run across some terrific ideas. Some great ideas came from a family in San Diego who do a yearly "adults only" Halloween party. Last year's theme was pirates and they graciously shared some photos. Maybe they will give you some inspiration and prehaps, a few more projects to tackle.