I was inspired by these photos I found on other people's sites:
On a tree
On another tree
On a piece of wood
Here's what I did: I have some aged Eucalyptus limb sections from a friend's tree that came down almost 20 years ago. I've been using it for firewood. Downed Eucalyptus lasts a long, long time here. I found a section about 10" / 25cm long as it once grew on the tree, but not cylindrical - it is somewhat oval in cross-section, about 10" on one axis and 6" / 15cm on the other axis. It is also longitudinally ridged. Because of this it lies flat on the ground and does not rock and roll at all.
I set it flat on its side and decided where to put the plant. I drilled three small holes on an isosceles triangle just a centimeter or two away from the base of the plant, to accept long pieces of a thin wood dowel that I cut into three. I tied string around the three pieces at two spots to form a cage supporting the long canes while the roots attach. I used fishing line to attach some sphagnum moss around the roots.
[Original 2015 10 16] Too dark to take a photo now, but maybe tomorrow.
[Added 2015 10 17] Here is a photo. The tallest stem from base is just under 18" / 45cm.