"In the late seventeenth century, an entirely different aesthetic sensibility and the development of the art market meant that Tudor pictures could be regarded as shoddy and outdated articles which could be recycled as firewood or as timber for furniture repairs. In 1662 John Evelyn records that portraits of Queen Elizabeth were 'recycled' over several years at Essex House in London by being employed in the kitchen ovens as the wooden boards on which to bake bread (known as peels)."
--Tarnya Cooper, "The Enchantment of the Familiar Face: Portraits as Domestic Objects in Elizabethan and Jacobean England," in Everyday Objects: Medieval and Early Modern Material Culture and its Meanings, Tara Hamling and Catherine Richardson, eds. (Ashgate, 2010): 157-177, p. 177.
(I checked this book out yesterday for the essays to do with early modern clothing - imagine my starry eyes when I saw that it had an entire essay on pins and aglets by Jenny Tiramani! - but I'm enjoying dipping in and out of the other essays, too.)