Work with textures!
How about for me (I've just finish rewriting all sailing stats for all 219 ships):
1. A French, or generic skin for USS Constitution. I'm not sure how you can mask out the "C O N S T I T U T I O N" nameplate from her though. The decor seems integrated to the model, not the texture.
2. A Royal Navy version of Hooker1. Basically, replace the scarlet paint with white and we have a sweet little battle schooner. Something to catch them American privateers with...
3. A white snow-brig. All white with golden embroidery. Since its the same hull used as the gaffsail schooners, you can reuse the texture for white schooners!
P)
4. Are we keen on "pirate" variants on the small ship skins we have? I just encountered a pirate frigate in WBT playtesting and whoa, the dark paint and black/red sails does make a HUGE difference in the night. They're practically invisible. It may not be historically accurate but it does create that fear factor when you see one such ship coming at you out of nowhere.
I'd like a darkened out pirate xebec, schooner, any little ships pirates like you like to use. Not F-117 stealth fighter black, but just darkened out and weathered, with all the wood effects evident.
Well don't do all of them, I'm not your employer (lol) these are just suggestions for adding a bit of detail to what we have :3
Thank you for your interest.