I would hold off on adding code to a resume.
Typically a hr-type person will screen a resume for keywords/skills.
Since they are not technical they will not understand the code you are writing or even be able to tell what language it is in.
You may- want to have some available for a second round interview or demonstartions of projects that you have done.
If you are lacking "beef" try joining an open source/non-profit project and using that for beef.
Working with others definitely helps and may give you additional skills that you didn't even know you had.
"The social dynamics of the net are a direct consequence of the fact that nobody has yet developed a Remote Strangulation Protocol." -- Larry