I usually have students complete this assignment at the end of the year. The idea came from Penny Kittle's "book love" philosophy of choice reading. At the end of the year, students decide which books from their year (or life thus far) would be on their "ideal bookshelf." Then I have the Google Image search the book spines of those books (or they use my classroom library). They duplicate the spines of those books. Very cool when they are completed.