Go to the Handy Hints, Gadgets, Projects and Gizmos thread and there are examples in it. They are not for a solar light but could be easily adapted. Basically they use a 3" Toilet Flange and then an adapter to go to 2" PVC pipe. At the level where you want the wood sign you put in a 2" Tee and reducer to 1" for the sign holder and add a 1" cap on the end. You would need to adapt to whatever fitting you have on the solar light on the top of the 2" PVC. Paint it to suit yourself. If you end up making one, please post what light you end up using. I have been thinking about making one but was planning to use a 12 volt bulb in a regular outdoor fixture mounted on a PVC pole as described above.