Here is an idea that would give the possibility of variations from the same clipart. With cliparts existing as a 3D models you can rotate. Change camera angle for the scene. Maybe change material, color or textures. This way you get a unique clipart image to be used in your text every time. The simple way to implement this is to use Blender (3D program) to render the cliparts you like from a site where people upload their free 3D versions of the typical clipart images. The 3D versions should be finished scenes in Blender so that they could easily be rendered.