Don't forget the Wars in South America. The 1879-84 War between Chile, Peru and Bolivia is well worth looking into. The armies look like European armies and are equipped in a similar way, they just don't always fight like them.
I have been working on forces for the Crimean war using a mix of Strelets and Emhar figures filling the gaps with conversions and a few metals from Tumbling Dice. Many of the early Strelets sets are out of production and all but impossible to find, sculpting quality aside,so I had to get creative: British Line infantry came from Austrian Grenzers, mostly a simple paint conversion, while Russians were made from Prussian Landwehr. My Strelets guardsmen had to have command figures found in another manufacturer's Napoleonic command set, while my Turks are led by converted 1877 artillerymen!
I'm always surprised there aren't more sets made for these interesting and colourful conflicts. I guess once again its down to popularity and awareness. There is an absolute treasury of inspiration for the modeller and wargamer and so surely a niche that could be filled by an enterprising manufacturer? Unfortunately, people, even in the countries these events took place, often know little or nothing about them so I guess that would undermine sales against better known (if less colourful) conflicts.