I basicly use various icons from screenshots from Imperialism II, Icons found on the net, resource and lux icons, and city icons.
Ive used the bible culture icons and the flask from the city icons to create the technology diplo icon. I have forgotten the original author of thoes two icons and wish to give credit to him or her.
Imperialism II style Diplomacy Icons 2016-10-05
Imperialism II style Diplomacy Icons