Back in my block building heyday I took the conscious decision to produce a range of blocks for Irregular, Tribal or Native types, primarily for use in Colonial style games. Indeed, I fought a couple of Zulu war actions using them as well as some actions set set in the Roghan Valley (a fictional North West Frontier set up) and even one from the Arab Revolt set in 1917. These blocks were also used for Indians during the French and Indian War. I used standard military symbols but adopted a colour scheme that could pass as the troop types being represented. For reasons that seemed like a good idea at the time I also produced a number of blocks that I intended to use as, of all things, Ottoman Turkish Janissaries.
The blocks I came up with look something like this: