You can visit my post about our Christmas Tree Theme last year.
Merry Christmas Curious George by Margret and H.A. Rey is a favorite book at our house. George finds himself getting carried away after climbing into a tree. He ends up at a hospital and has fun decorating the tree with all kinds of unusual things he finds.
We sang "Oh Christmas Tree". This link has the lyrics and music so you can sing along. My four year old has actually fallen in love with this song and has asked me to sing it a couple of dozen times.
Felt Christmas Tree (even my son who is under the age of 2 was enjoying this activity)
Torn Paper Christmas Tree (we also punched a small hole in it and hung it on our tree)
Triangle Christmas Tree. You can also check out my previous post about them here.
Christmas Tree lacing card- this is a homemade lacing card I made a couple of years ago.
Christmas Tree craft we like to do using popsicle sticks.
Rice Krispy Trees are a fun activity to do in the kitchen. (these are supposed to be green, but I couldn't find any food color at my house)
This Christmas Tree File Folder Matching game from Little Piles Everywhere.
Confessions of a Homeschooler.
Living Life Intentionally has a fun ornament shape game that we played.
2 Teaching Mommies has a great Christmas Tree pack which include this fun puzzle.
Winterwonderland Pack that includes this Christmas Tree coloring page.
If you are in need of some Christmas Tree patterns this link has a bunch of different ones to choose from.
If you are still looking for more ideas you can check out our Christmas Tree theme from 2009.