I found the instructions for making a shaker ornament (with fake snow inside) here . The example uses a graphic of a snowman, but I think this would be awesome with family photos in place!
I love snow and snowmen and have a whole tree's worth of snow-themed ornaments. This pattern for a snowman photo ornament is something your children could make. If you're anything like me, you'll want to make some too. :)
This Christmas photo ball ornament involves cutting a photo into strips, which seems so wrong, but makes an awesome, lightweight ornament!
Excuse me while I go work some digital photo magic on my laptop. I've got some photos saved there that I want to use in my Christmas project!