One of my favorite things to do at Christmas is decorate! I've always loved drawing and I think it's great to be able to add your own personal touch to your decorations.
Drawing cartoons is pretty simple as cartoons are simplified versions of things we see in real life. Right now, there's a Cartoon Santa, Christmas Tree, and some other lessons up at my site. I've included a link in my signature below.
I recommend you check it out. The lessons are all free and they don't take long to work through at all.
Best of luck!