My idea is a "papercraft writer". Papercrafts are small paper models that can be made from paper by cutting and gluing them together.
It would be awesome to read 3d model files (citygml, obj, ...) in fme and have the possibility to write pdfs with cutout-sheets for little papercraft /papertoy models. So we could offer the citizens of the city as a fun gimmick to export their own building as a handicraft sheet.