The first phrase, "sand sculpture" or 沙雕 is a homophone (similar pronunciation, different meaning) for 傻屌 (literally means stupid dick), but just like how "fuck" is censored/filtered, people use homophones to evade such censors. By the way, "沙雕" is interpreted as "sand eagle" (one might even say desert eagle) rather than "sand sculpture" when using it to call others stupid.

As for the other two, I'm not quite sure what you're looking at.