There are blue poems with the author's source

Palace naturally pity jade slave, what is love the sky. -Zheng Qingzhi's "Reconciliation with Meiyun"

Silver carp's blue, first dyed evenly, wrinkled by the wind. -Zheng Deyi's "Eight Scenes of Dragon Swimming and Fine Wind"

The method of teasing is forced by Yan Yu, and her nails are blue. -Liu Kezhuang's "Four Official Tunes"