[Yardstick]

Both good but I think the first would make the better bumper sticker, which is how I would want to display it.

[Oceander]

Here's a third version, which I think would be suitable for a square sticker:



I have it on a round sticker at the online store-front I have, but not on a square one since the company that runs the website doesn't seem to offer a square sticker size. If you can put it onto square stickers, please feel free to do so. The direct link for the image is: http://i758.photobucket.com/albums/xx221/B_Oceander/1Designs/I-heart-AZ3_med.png