OnMyComp.com

I am a bit late with this one. So it won’t give you a lot of time to get these…..
Gmail is offering to send you sticker !!
You first need to send them an “self addressed envelope” and then you will receive the stickers.

So how do you get your stickers? We may be all about speedy electronic communication, but this time we’re going old school with snail mail. Just send a self-addressed stamped envelope (along with a note if you’re so inclined) to:

Send me some Gmail stickers already
P.O. Box 391420
Mountain View, CA 94039-1420

Make sure to include enough postage to return a sticker pack via U.S. mail. It’s less than one ounce, so a standard $0.42 stamp will do if you’re in the United States; enclose an international reply coupon (IRC) if you’re outside of the U.S. And be sure to send your envelope in soon — one per person please.

Source; Gmail Blog