I think it would be fun to have an artist skill that would be an expansion on penpersonship. Once you learn the skill, you could by "crayons" and get a piece of paper. When you click on the crayons a little drawing window would pop up where you could select a color and draw lines with your mouse to make a picture (just a really basic flash drawing program). The picture would then appear on the note. You could give notes to people or leave them on the street. You could use this to make a treasure map or just draw a picture.
Once houses are customizable you'd use the skill to draw on canvas and make pictures to hang in your house. You could sell them to others and make a living as an artist. Perhaps in the future you could also decorate t-shirts with this skill. Imagine making a design, saving it, and then making 10 t-shirts with it. You could have group t-shirts!