This tutorial is based on the Draw a Christmas Tree Step-by-Step tutorial from About.com Drawing/Sketching Guide Helen South.
I've adapted Helen's pencil/marker drawing tutorial to the computer. My Christmas Tree is drawn in Windows Paint 7 which is a very basic paint program. Use Helen's tutorial for learning to draw the tree. Refer to this tutorial for tips specific to drawing this same tree using basic programs like Windows Paint as well as Photoshop and other bitmap editors that have features that can make this an even easier project.
While a graphics pen can provide a drawing experience that's closer to using a pen or pencil, with this cartoon style of drawing, you can still get good results with a mouse. The Christmas Tree in this tutorial was drawn with a mouse.
Once you've drawn your Christmas tree, use it in your own greeting cards or other holiday projects.