Neo-Standard isn't a mod. Neo-Standard is a guide for shipset creators and mod makers. It allows people to create shipsets that will include images for most mods available, and will allow modders to make mods that will work well with most shipsets available.
Granted there are mods will hull types that fall outside the neo-standard shipset, which is why some people make sets are are called neo-standard+ (or however many + should be on there).
Some mods that take advantage of the extra images in a neo-standard shipset are; Adamant Mod, Carrier Battles Mod, Pirates & Nomads Mod, there are others as well, but I am tired and high on muscle relaxants so I'm sure others can fill in the blanks. People love to plug their mods