Piratey floorplans / Battlemaps (Forts, islands, caves, ....)

[Cherno]

I'm trying to find full-color top-down maps of locations such as forts, islands, ports, caves etc., all those very piratey places Swashbucklers typically end up in rattling their sabres (arrr!). They should be suitable for 28mm gaming, but the only ones I know of are the ship battlemaps from Privateer Press and the old Skull Cove paper terrain set from World Works Games. As I'm a little bit experienced in graphics editing via photoshop, even ripped graphics from computer games could come in handy.

So if anyone can help me with information, please rattle your sabre and let me know