Glad you like the pen. Here's a quick inlay how to. Hope it helps:
To develop a uniform pattern of holes in your turning, you’ll need a indexing wheel (my Oneway has 24 index points) and some way to drill a shallow hole in the same location each time, as the piece is rotated...I’m using Oneway’s Drill Wizard
http://www.oneway.on.ca/workshop/drill_wizard.htm
After turning, but before sanding, set your lathe's index to position one and drill a hole about 1/32†deep in your piece. I’ve used a 1/8†drill bit in this example. Fill the hole with fine glitter. I’m using Createx Iridescent super fine glitter
http://www.dixieart.com/Createx_Specialty_Colors_and_Glitter.html, but you could use crushed stone, powdered metal or any other fine powder-like material. Once the hole is filled, very carefully apply a small drop of thin CA (instant glue) on the edge of the hole. The thin CA should spread though the fill material in the hole via it’s capillary action. Then a short squirt of accelerator to set up the glue. Re-index the lathe to the next drill position and repeat the process. The pen in this photo has four rows of spiral holes, so the indexing is 1-7-13-19 on a 24 point wheel. After all the holes have been filled, turn on the lathe and dry sand at about 120 grit to remove all the excess fill material and glue, then finish sand as you normally would.