We found our tree by the side of the road - allowed it to dry out, then attached a piece of plywood to the bottom that fit in our terra cotta pot snugly. We created a plaster mold (2 half circles) that fit around the tree base and tightly in the pot. This allows us to "disassemble" the tree, making moving it to a venue or just around the shop so much easier. The tree gets tiny green leaves in the spring, orange / red leaves in the fall and a dusting of snow and red cardinals in the winter. Our ceiling is covered with several grapevine garlands (thick, multible strands) and tiny white lights. The garland get cluster of grapes late summer, snow flakes in the winter - whatever we can find in mass and are affordably priced. We did learn a valuable tip when installing our second garland - soak them in hot, hot water for about 45 minutes prior to haning. This makes them far more flexible and far less prone to scratch the heck out of you as you manipulate the blasted thing into place.
I'd love to see pictures of what others have done.
Leah