Baubles were decorations obtained by skilling or killing monsters. These were used for the Christmas Event 2013. They were obtained commonly every 15 minutes. You could use them to decorate the tree in the Lumbridge crater for 10 points per bauble. You could choose to decorate the tree nicely or badly for either nice or naughty points. Everytime it appeared, you will receive the following message:
"Congratulations! You've found a Christmas bauble!"
These could be collected from monster drops and training skills.
You can use your baubles to decorate the tree in Lumbridge crater after speaking to San'tar Claws."