Simple mats cut from wallpaper remnants or sheets of decorative paper work magic on serving trays. Drinks are less likely to slide around, the tray is protected, and snack time is brightened up by this unexpected bit of color and pattern. Using scallop-edge scissors, cut the paper to fit the tray. For trays in irregular shapes, place paper pattern side down; next, place tray on top of paper. Trace tray's base onto paper. Cut out with decorative shears.