Nice pens.  I like the last two best.  I've been doing quite a few polymer clay pens.  I made four of them about 6 months ago and gave them away as test pens.  Two of the people hang the pens on a lanyard around their neck that holds our ID badges.  The plating has begun to wear off those two pens, but the clay has held up fine.  I used a CA finish on them and it looks just as good now as it did when I finished them.  My biggest problem is the clay flaking as I turn them.  I've been thinking about cooking big blocks of the clay and then trying to drill them.  As it is now I've been wrapping the tubes.
Good looking pens.  I kind of look at polymer clay as the poor man's resin casting.