|Using a four feet by eight feet (4 x 8 ft) sheet of double wall cardboard. Divide it in half longwise. Now there should be two separate pieces two feet by eight feet (2 x 8 ft).
|Measure and mark 6, 12, and 18 inches so there are four equal widths and draw a line the length of the card board.
|Score these lines without cutting through the material. The card board will now bend evenly to give a rounded tree trunk look and stand without props.
|Lay the piece down and measure four feet from the end to find the middle.
Mark a line across the middle and score along that line so the tree can be folded in half and stored when it is completed.
|Gently apply the spray foam insulation moving in a moderate pace so lines are thinner, bumpy and ununiformed. Begin at one end of each row and move down the tree longwise.
|Be patient and allow the foam to completely dry overnight.
|Move the trees to be painted by standing and opening them. Use long spray streaks of matte finish paint.
|Colors should vary; primer brown, brown, dark brown, green and light green, gray and black. If you cannot reach the top of the tree, turn it upside down and finish painting.
|Let it dry completely before cutting through the foam along the middle line. Fold and store.