Model code - open to bidding

I need a complete code that follows standard conventions to submit to an employer for interview. The code should be functional, it need not be huge. Around 1000 lines is what I expect but most importantly it should demonstrate most of the programming traits. The code can be an old one, may be, from your previous projects but it should be working, I really dont care but it should not be in the public domain. I can code but this time I need to impress, so I am asking for your help.