Mmm, pure c-script? Not really, you'd have to use a shader for that. I've posted one a little while ago, check it out here:
wireframe shader Although I'll admit finding something using the 'search' often gives unexpected results eventhough the keywords are correct and make sense, but searching for 'wireframe' alone would have got you this thread too.
Just so you know hehehe, anyways have fun,
Cheers