Mail art

I am thinking of what to make for these mail art project which came through from Frips, in Belgium.

http://www.frips.be/

As I understand it, I am to i. make a card using the "Human rights" sticker, perforated on the white postcard and return it to Frips, and ii. to add something to the collage sheet and send it to another person.

I am trying to think what would make a simple bold statement.