Where do you get the gecko sticker in Littlebigplanet?

In LittleBigPlanet, the gecko sticker can be obtained by completing the "The Gardens" level. Specifically, look for it in the "The Gardens" story mode, where it is typically found hidden in one of the areas or as a reward for completing certain challenges. Collecting it adds to your sticker collection, which you can use for customizing your character and creations.