绿云堆一枕
[lǜ yún duī yī zhĕn]
This beautiful idiom comes from a classic poem in Song Dynasty which describes lush cloud piled up like a pillow, representing a scene that is picturesque and tranquil. For someone choose this line of poem as his nickname probably wants others to perceive him/her as poetic, delicate and gentle, also showing admiration for nature.