I've started to get tired of seeing the same buildings in every game, and have created a couple of new improvement icons I want to use. The problem I'm having is that the only way I can get them to show up in the game is to swap them out for icons in the main game folder.

Is there a way to get new icon images to work from the mods directory? I don't want to create any new improvements, just change out the icons for the standard buildings.