Xi Chun's verdict in A Dream of Red Mansions is: "It's not long to discover the third spring, and the clothes are changed to the clothes of the previous year. Poor embroidered housemaid, lying alone beside the ancient Buddha of Qingdeng ",suggesting that cherishing spring ends in becoming a monk."

Blue lanterns should be a symbol of the poor life of Buddhists.

After reading another answer, I went to search for "Qingdeng Huangjuan" and felt that my answer was one-sided. Handling to supplement, for reference only.

1. The following is an excerpt from Baidu Encyclopedia's entry "Blue Lantern Yellow Roll":

Blue Lantern Yellow Roll means an oil lamp with blue light and a book with yellow paper, which means studying hard.

Source: Yuan Ye Qing's Cold Lights in the Bookstore: "The yellow curls of the green lanterns are longer, and the flowers are fragrant at midnight."