My background is in web application development, which typically means a script or even a framework application that accesses a database. That seems a little large for a code sample.

So prepare a tarball with the complete source code, and include one or two pretty isolated routines, maybe with a short description about the context they are called in.

I have a homegrown project that's an amusing distraction (it's an implementation of runoff that I did for a git flow presentation), but while all of the 16,000 tests pass, and perlcritic's OK with the source code, it's in mid-development, and not ready for prime time.

Polish a part of it and highlight it. No software is ever really ready for prime time, and no recruiter will look through enough code to make 16k tests pass.