We do a Christmas sock garland. It was based on an idea from www.familyfun.com
We use a pre-made garland and use clothespins to hang 24 Christmas socks, which include socks for each family member. Every day we put either a small treat, something to represent an activity to do together that day, hints to find a gift that doesn't fit in the sock (ie a new Christmas movie or game), etc. I love how the socks look hanging from the garland and my kids love opening the sock of the day. (:
I know a lot of people do this and I'm considering doing it this year....wrapping 25 Children's books and opening one/day in Dec.
We are devout Christians and one other thing I'm considering doing this year is making 25 ornaments with different names on each that refer to Christ (as found in the scriptures.) Then, each day we can choose one ornament, discuss the name, and then hang the ornament on the tree.
This is a great question and I look forward to hearing more responses!