The Ad pad is a plain paper pad designed specifically for advertising creatives. What makes it special? The squiggly black border that beckons you to fill it with an ad idea. It says I have 55 pages of CANNES LION WINNING POSTERS here if you'd only jot them down already, you lazy git. It challenges you to fill the blank. It screams "white space does not communicate".
Of course, the ad pad is everywhere too. On twitter: @the_adpad. On facebook The ad pad. Oh, and if your creative department runs out of ad pads, have them order some new ones with this handy form.