Today while flipping through the Tidball monograph, I realized that the pattern for this decoration came from this very publication. Tidball instructs making tiny 4-inch decorative trees, probably to hang as a real Christmas tree decoration.
You can see by my grandmother's annotation on the photo of the small trees what she thought of them.
Her trees were a couple feet high and hung from the florescent light banks in their living room (light for weaving!). Unfortunately I can't locate a photo of these
Here are the instructions in case you want to make your own. If you try it, will you send me a photo? The first page is to make the small ones my grandmother thought were awful. The second gives you an idea how to make the larger twisted variety.
The monograph, should you have it on a shelf somewhere, also has some lovely ideas for making woven Christmas cards. Maybe one day when I have a little down time I'll give that a whirl. I'm sure I can find a free loom somewhere around here for that project.
Merry Christmas Handweavers!!Update 12/24/14: A excavation expedition was mounted to my parents basement and one of Marian's decorations was uncovered. We didn't discover any of the twisty trees, but this one was hanging over her fireplace every Christmas for many years.
Source: Tidball, H. 1963. Merry Christmas, Handweavers, Shuttle Craft Monograph Ten, 21-22.