I have made my mini trees at about 28" to 30" , then my not as small ones using the larger gauge tomato cages, thes are about 4.5' tall then I have a couple of med trees that are the pvc pipe variety with cmu blocks for the base (no guy wires) with 16 channels and two colors. Then I have two mega trees one if 32' tall and has guy wires at 3 locations with 48 channels (clear, gold, green and multi), the other is a 19' spiral mega tree that has 24 channels with three colors.
I did a couple of the mini trees with garland but decided that night time was my preferred effect so I have just lights now.