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The Law Library at Yale University is displaying volumes from its rare book collection that have been bound using other texts as scrap material. The exhibit, "Reused, Rebound, Recovered: Medieval Manuscript Fragments in Law Book Bindings," includes these twelve small volumes of the Corpus iuris civilis, published in Lyons by Guillame Rouille in 1581, which have been neatly covered by pages from a biblical manuscript, ca. 1350-1450. For more pictures, see Nancy Matoon's discussion of the exhibit on Book Patrol.
This example shows that the relative iconicity of texts varies considerably in time and place, and not just in the contemporary rare book market.