I just came across another awesome idea, Advent crafts.

The blog Lilla A, a swedish blog (also written in English luckily ) has amazing children's craft activities and is putting together 24 different craft activities using things from around the house. Every day of Advent, a new craft will be posted. If you google Lilla A you should find the blog and then the Advent Crafts are collated under the first button to the right of the blog header.