I made an advent tree out of 3/4 in plywood...simple pine tree shape about 2 ft high. We stained the top part green and the trunk brown. I pounded in 25 brads scattered across the tree part with one at the top. We put it up on December 1 and hang a little ornament everday until Christmas Day when a shiny brass snowflake gets hung on the top one. My kids loved this when they were little and kept scrupulous track of whose turn it was to put on the day's ornament. They still make sure we get it out.
We fill the stockings on Christmas Eve, but we don't open any stocking stuff until New Years morning. There is a TON of stuff for Christmas morning so holding off on the stocking things stretches things out a bit and made New Year's fun for them even when they were too young to make it to midnight.
We found a tiny song sparrow nest and put a glittery bird ornament in it, a glass pickle and a walnut that we decorated with glitter. Each of the kids hangs one of these on the tree at the very end and the rest of us look for it...there are traditional stories associated with each of these.
My husband reads Clement Moore's "Night Before Christmas" every Christmas Eve. Last year they were 22, 20 and 18 and when I asked, they said they still wanted Dad to do it. This year my oldest will have her own place and I'm giving her a copy of the book as a housewarming present.
Everybody gets new jammies on Chrismas Eve. They get wrapped an put under the tree early in the season so there are presents under the tree for decoration. Each child had a Christmas collection from the time they were little, too. The girls get a new piece for their Christmas villlages and my son collects nutcrackers so he gets one of those. They go under the tree and are opened on Christmas Eve, too.
We put the tree up and decorate it the day after Thanksgiving.
We make it a point to watch Christmas Vacation and Love Actually sometime during the season...a little non-traditional!