Drawings, contest submissions, flyers for friends, etc. If you are constantly working to improve your ability as a creative chances are you have a large archive of unpublished work. Some of it great and some of it mediocre at best. In the end the work still has value. Whether it be sentimental or promotional.
Below are some pieces that I did for friends, myself, and for design competitions. "Bang!" is one of my favorite works because it helped me win a design competition. One that I still gloat about to this day... hehe. I know. I'm six. What can I say.