Fabric- scraps are great for this, but if you're purchasing- fat quarters or even fat eights will give you plenty of fabric to work with.
1. Cut two rectangles of fabric and line them up right sides together.
2. Mark the center of the top of the rectangle, connect this center mark to the two bottom corners of your rectangles.
3. Cut along the lines to make a set of triangles.
4. Sew around the sides of the triangle using a 1/4" seam allowance. Leave about 1- 1 1/2" opening on the bottom. Back stitch at the beginning and end of your stitching. Trim the fabric down on the corners, cutting near, but not through the stitch lines. The steeper the angle of the corner- the more important it is to get as much of the fabric trimmed as you can.
5. Turn the triangle right side out, use a blunt narrow tool (like a chopstick or the flat end of your skewer) to push the corners out- but go easy as you do so, you don't want to poke a hole in the fabric.
Fill the tree with fiber fill. If you have an old cushion you don't want anymore- you might have all the stuffing you need already. :)
Use a needle and thread to stitch the opening shut. Leave about 1/2" opening on the bottom to insert your skewer.
Take your scraps of wood and drill a hole just large enough for your skewer to fit in. My skewers ended up being 3/8" in diameter. I painted my skewer and wood together, but if you want to be able to pull it out to store it, paint them separately. Now all you have to do is slide your tree onto the stand. Using a skewer instead of a dowel makes it much easier to slide it on through the stuffing because of the pointy end. You can adjust the height of the tree by sliding it higher or lower on the skewer- if you want them even shorter you can cut your skewers.