Easy DIY Christmas Card Craft makes for a fun indoor activity!
Handprint Christmas Tree Cards - Kid Craft - Glued To My Crafts
(Ideas to create your own Lego advent countdown) Five Christmas LEGO Projects to Build - With Instructions! Train ornament, nativity set, snowflake ornament, Rudolph, and cube ornament. The post has links to more Christmas ideas too.
Homemade Christmas Cards, would be cute with painted dots and a ribbon