Fold card in half horizontally; use a utility knife and a straightedge to make narrow pairs of slits perpendicular to the fold and about 1/8 inch apart. Vary the lengths of the slits so that trees will be staggered, not in a straight line.
Push the tabs from behind, and crease in the middle.
Trace templates onto paper, and cut out. Decorate these shapes, and glue to the tabs. Glue into a larger prefolded backing.
Colored and textured paper
Trees fashioned from colored and textured papers are adorned with sequins and glitter.