In my opinion perhaps something a bit more eerie with a touch of imagery. Perhaps fitting the NSA symbol in there or an eye that's always watching with a mini-surveillance camera. I don't know how detailed one can get with stickers but a few almost hidden items such as is found on the dollar bill might be effective.
Let me know when you complete your project I would be interested in looking at it and possibly buying a few stickers. Very important stuff. In the spirit of ideas here is a link to an ongoing thread titled: WAR ON TERROR IS ORWELL'S NEVER ENDING WAR
http://www.democraticunderground.com/discuss/duboard.php?az=view_all&address=364x467535And a few images:





“If you’re not doing anything wrong, what do you have to worry about”, the oft recited cant of the surveillers.
“There was of course no way of knowing whether you were being watched at any given moment. How often, or on what system, the Thought Police plugged in on any individual wire was guesswork. It was even conceivable that they watched everybody all the time. But at any rate they could plug in your wire whenever they wanted to. You had to live—did live, from habit that became instinct—in the assumption that every sound you made was overheard, and, except in darkness, every movement scrutinized.”
- George Orwell