Sharpie markers - like you can buy at most office supply stores in the US, and Tempra paints - some of you might remember those from school. Three primary colors, three secondary colors, plus black and white... or essentially the colors you'd get in a box of 8 crayons. Some of what you see below is mixed colors, and some colors straight from the factory-mixed bottles. I learned that small amounts of a darker color added to a lighter color change the hue much more than you might think.
Signing your name with a paint brush is an acquired skill that has not much to do with how well you can write with a pen or pencil... My signature was cloned out of the graphic below both for asthetic purposes (it's horribly sloppy)... and because I don't like posting my real name online.