Originally, we were just going to put Santa hats on all the characters, but it turned out that it be more work than just replacing their heads (believe it or not). So last minute, this is what I did instead and had help setting up these heads from Ryan Duffin https://www.artstation.com/animationmerc
I also changed the textures on all the gadgets to make them Christmas themed as shown in the video clip with the exception of the snowmobile which was done by Takehiro Hattori

https://www.artstation.com/hirohattori

My favorites are the crying penguin for the medic pouch and the snowman ammo pouch.