I am considering trying to sell some of my civil war reenacting pictures as both ATC's and Postcards. am not sure if there would be much of a market tho.
one of my thoughts was the different ladies books of the civil war period and pictures of actual dresses of the time would be a wonderful way to study the clothing styles colors and trims.

this is an example of one of my bits & pieces
its a suplice (sp?) bodice & sleeves ca 1859

since MOST people either cannot afford to collect those books and the few books that have a 'collection' in them are limited at best. my thought is to offer cards of everything i have photos of with data on the back (what data i have that is) like regular trading cards they would be very easy reference materials.