Whenever I walk through my local supermarket, I see so many giftcards, for Facebook, iTunes for League of Legends, and so much more. Google are the latest with Google Play Store receiving some gift cards, which are clearly marked as such.
Android Central have snapped a few photos of the $10 and $25 gift cards, where they display "Google Play" as well as "Music Movies Books Apps & More" down the bottom. The triangle logo is shown off quite well, and should stand out from the crowd of gift cards, hopefully.
Unknown at the moment, is where the gift cards will be made available. I'm based in Australia, so I most likely won't see them until 2015 or so, but if anyone in the US (which is where they'll most likely launch first) sees them, please do let us know in the comments below!