This was a household effort, so I can't take all the credit (if any is due!!). Perfect for those with limited storage space, hanging decorations but nowhere to hang them, and no kids who pester you for the "real thing".
Took some cardboard from our moving boxes, and drew a template that was as symmetrical as possible (we used rulers). We drew 6 "limbs" which started out as triangles of increasing size as you go down the tree, but with little up-tilts at the end of the branches to hang things on. Cut it out with a stanley knife and used it as a template for another one. Drew a line from the tip down the centre, and made an incision up from the exact middle on one, and down from the exact middle on the other. Painted it with green acrylic paint. Assemble simply by slotting one onto the other at right angles, and voila! A christmas tree that will store flat for next year when the 12 days of christmas are over! Why would you ever want a a real one?!!