Here's one that I just finished for a colleague. He didn't want to specify what style of pen, just that it be yellow. I figured the most useful pen for him would be the same as the most useful pen for me - the 'Shirt Pocket Fountain Pen' - easily shirt-pocket sized (with a clip), and conveniently and securely postable. It happened I had some of this nice yellow and black acrylic, so off I go.
Oh ya - nib is steel JoWo, and fill system is cart/converter.
Thanks for looking!