Kids will get a real kick out of decorating these little evergreens -- the mini bulbs come alight when you punch holes in the outer layers, revealing the colored paper sandwiched between them.
Sandwich the red and yellow paper between 2 pieces of green card stock. Cut out a tree shape.
Remove the red sheet and punch a few random holes through the 3 remaining layers. Then remove the yellow sheet and replace the red one. Punch several new holes through the stack.
Cut a tree trunk from brown card stock (make it a little taller than needed) and glue the top of it between the red and yellow layers. Now glue the green layers to the outside.
Use the pushpin to poke a hole through the 4 layers, about 1/4 inch from the treetop. Thread a length of monofilament through the hole, then slide a button tree topper onto each end of the line. Knot the ends of the line to create a loop for hanging.