[krapp]

I wouldn't get too hung up about it. Just having a Github account puts you ahead of the curve, and most Github accounts are just random personal projects and junk, including mine. My current employer even pointed out that I have the same problem (very few comments and not much documentation) with my projects, and I just told him "it's all personal projects" and it wasn't an issue (but YMMV obviously.)

Most employers don't care. Of the ones that will, most will only give your code a cursory glance just to make sure you're not a drooling imbecile. For those employers who actually look and actually care, maybe, have one really shiny project and refer to it your resume. Really work on some final projects and consider posting those. Although, if you do add documentation and comments, etc, then your projects will be more attractive to the open source community as a whole (which will, of course, make you look better to employers.) But do it if you want to, not because you feel you need to.