If you collect cool parody stuff, this Send Noods Please Sticker (2.23-in.  x 2.41in. Kiss Cut sticker Vinyl), a humourous take on the Gadsden "Don't Tread On Me" flag is available at Low Speed Gear... "It seems that there are a lot of Gadsden parodies lately, so I decided to weigh in. Send them noods over please."

Thanks to Primer/Ted Colgrove for the link.

May not exactly what you need in airsoft games, but these stickers will add to some tactical comms knowledge when you need it or having it as playing the part. These Are now available at RE Factor Tactical at US$4.95 each...

This is cool, something to stick unto your car windshield, and it's FREE!, the MadBull Static Electricity Sticker..."Ask your local retailers if you need one. It's free. For retailers and end users. 16X16CM Static electricity sticker. Make sure your windows is clean (no dirt, water, oil...) and put inside your window. See photo attached. Best Regards, Mad Bull Airsoft".