Book Covers make wonderful "art mats" to protect desks and tables during art lessons. (Thank you Mrs. Brown.) Your school probably receives free book covers from various vendors at the beginning of each school year. (Hint, if you can't find 'em, check your library.) They last forever, but be forewarned, kids will beg you to keep them for their own. Then after they've been used often, adults will want them too because they end up looking like works of art.
(Back of mats)(Front of mats)
These art mats have been used this year by kids at 5 different schools. That's more than 1,000 students!!