Replying to Creative thinkers...

ok so i landed an interview for an international marketing/pr firm and after the 2 hour writing test i have to take i have to make a 30 minute pitch to them about myself - thats the interview.  right now im at a blank of what do do.  i really want to stand out and not bore them with just going from my resume.. im leaning towards making "myself" be a "product" and i am marketing my brand (me) to them (if that makes any sense its hard to explain what i want to do)  i need some help or suggestions - how would you guys pitch yourselves to a big firm? im pretty open for everything because im just sitting staring at a blank powerpoint - and should i even go with a powerpoint? hahah last fucking minute as usual. any help would be awesome