Looks pretty cool.. dont they?? Gmail Stickers. But how to get these?
Just send a self-addressed stamped envelope 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.
Conditions Apply*
For more information and story of Gmail Stickers, visit the official Google Blog.

*additionally lawyer requested terms from the Gmail blog: while supplies last, Google won’t maintain your contact information in any way, and these stickers are “void where prohibited and only while supplies last.