PHP - Cool!

I am trying to find a job doing PHP and MySQL. I have a portfolio section where I created a really simple Postcard application where visitors can send people they know online postcards via email after they click on confirmation link i send them using sha1() as token in a temp table that holds information.

I was also going to add a section where I show usage of Regular Expressions and things.

Does anybody have any suggestions what other web apps or whatever I could add to this section to make my portfolio section really POP to potential employers? Any suggestions are welcome and much appreciated.