.svg is more an image sourcefile. (iirc, its an xml-based format.) Its used for vector-based graphics. .blend, again, is image-based, but, still, "source" (this time, for 3d models.) it is mainly ... [More] used in the open source 3d modeller, "Blender" (blender3d.org) LOC count... itsn't terribly meaningful, however, they are still useful for counting as a source contribution. Not everyone that contributes to open source projects, or any projects, really, are programmers. Some, are artists. [Less]