Do you have an Advent Calender in your house? My kids just love ours. We made one last year from toilet paper rolls and used it again this year (yes a little lazy...) yet it still looks good along our stairs... I found the instructions on the "Instructables" website click here for the details.
I fill it with activities that change daily, such things as sing carols, go for a bike ride, decorate the Christmas tree, bake gingerbread cookies, make a new friend, go and look at the Christmas lights etc etc. I also fill some days with a chocolate frog to keep things exciting. Our frogs have been know to "hop" to another day if children haven't been good though!
Here's a pic: