Thanks for the comments!
The basics are.....Make a design on paper and glue it on the pen blank. I freehand cut one line of the design on the scroll saw. Cut a piece of sheet stock (brass or aluminum) and scratch it all over with sandpaper to give the glue something to "grab". Glue in the metal, I use thick CA. Cut the next line and so on. Fairly simple process, but not so simple to complete! You have to make sure the blade's kerf is the same thickness as the metal, if you don't the pattern will get skewed with every cut. Take it painfully slow drilling and turning or the blank will explode! Make sure your drill bit and turning tools are sharp.