Cimaroons would be really cool. I think Grumpy 15mm has a Portuguese line with some African forces.
I'm currently working on a 15mm Portuguese Colonial Army for
DBR, using Grumpy figures. The Buccaneer range, also from Grumpy, both lacks tricornes and includes Cimaroon/African-esque crewmen who I have mixed in with my Shot (F) and Blade (F) (to use the Barkerese terms) elements for variety.
On a related topic, does anyone know how the Blue Moon Darkest Africa Tribal warriors compare size-wise with Grumpy/Essex figures? From previous experience of that sculptor's work (Blue Moon Italian Wars and Battle Valor Games Frigians) I would suspect them to be closer to 18mm, but there isn't a lot of choice around for sub-Saharan Africans in 15mm.