This year we decided on a Lego tree instead of a real one with Lego decorations. The main body is made of Duplo bricks, the decorations are regular Lego creations.
Trying to figure out the basic design.
Then we added some presents
We also made a center piece for Christmas dinner.
Some shots of the completed tree
We glued the Duplo bricks together with a water based glue. When the holiday was over, we put the tree in the shower and cleaned off the bricks. Yes, it was a pain and took about 2 days to get all the bricks clean, but we now have a very large green castle that used to be a tree.
Heh. Unfortunately, we've about bought out all the green Duplo bricks available on BrickLink. I think we had just shy of 700 bricks total in the tree. We're going to keep stocking up for next year to fill in the blank spots.
Good luck with your tree!