So, I present: the Angband sweater.
What I have learned:
- The thing with increases and decreases that's on the cuff really is the best way to arrange for a small non-flat-sided section of your knitting to be in reverse stockinette.
- Leaves should be at least seven rows high and should have more space around them. (Five-row leaves just look like blobs. Seven-row leaves actually look like leaves.)
- If most of the branches are two stitches thick, the roots should be too.
- If I do this again, I will move the tree up so that I can use four branches in the neck cables instead of two.
Chart is here.
Edit: Someone's got a nifty blanket using this tree here.