I go a bit overboard - I'm making a Jesse Tree now - and we do the below.
The envelopes are mostly for DH and me and our advent devotional - DS is 3 so advent is a little more about the stars; and LEGOs as a reward after celebrating the advent at night ...
Best site I've found for advent resources...
http://www.teachingmom.com/features/advent.html
by Amber Clegg and Jacque Larsen @ the-Lilypad
