A while back, I asked for suggestions on how to make an Advent calendar for kids. I got a bit of feedback, but surprisingly not as many ideas as I was hoping for. As such, my Advent calendar idea is still languishing away on my desk as I type this. Hopefully, I will get something together in the next week or two and be able to share it.
Since Advent is only 3 Sundays away (I know...shocking is it not??) and all the secular Christmas stuff has been up in the department stores for several weeks now (Goblins and monsters strolling around a grove of Christmas trees is truly a bizarre phenomenon), I would direct your attention to several excellent Christian resources that are available about Saint Nicholas and Saint Nicholas Day on December 6th (which as of this writing is a mere month away). When I say St. Nicholas, I mean the real one and not the commercialized Santa Claus concoction.
One excellent resource that I am involved with is the Saint Nicholas day resources on the American Friends of the Diocese of Jerusalem (of which I am a member) website. They have a whole section devoted to St. Nicholas, which includes lessons plans, recipes for cookies, hymns, and more.
I would particularly draw your attention to the following links from that site:
An Advent Giving Calendar in .pdf
A St. Nicholas Day Flyer
In particular, you can order a pack 10 St. Nicholas Day Mite Boxes for about $2.50. My daughter loves to put coins in the mite box. The box has a St. Nicholas prayer on it also that that little kids can pray.
There are also two excellent websites solely devoted to St. Nicholas education material, most of which is free to download without worrying about copyright infringement and all that:
The St. Nicholas Center and the St. Nicholas Society
Likewise, there is an open source Eastern Orthodox children's book with icons on St. Nicholas which can be found here.
I hope you find this information helpful. I certainly have as a parish priest.