All the periods I currently have in various stages of process

 A simple listing, all 15 mm unless stated otherwise:

Stone Age

Arthurian Age / Vikings / Robin Hood

Alexander Dumas' Three Musketeers - a variation

Pirates / French and Indian War / American War of Independence

Seven Years War (10 mm)

Indian Mutiny

American Civil War

Mountain Men / Pony Wars / Old West

Anglo-Egyptian Sudan / French Foreign Legion

Slightly Cracked Colonials (pulpy Scramble for Africa)

Boxer Rebellion

World War One: German East Africa

Prohibition Era Gangsters

Banana Wars (pulpy)

Vietnam War (10 mm)

So many periods I hope I didn't forget any.  Italics indicate enough figures painted for a game.  Will correct later if I realize any omissions.