There's a discussion thread on The Fountain Pen Network right now about ukes. One poster has noted a parallel between Pen Collecting and UAS, aka Ukulele Acquisition Syndrome. This must be true, because I'm a fountain pen fanatic myself.
If you've popped over here from the FPN, welcome to yet another circle of hell! (Oh, and I'd check out Peter Thomas's ukulele books for inspiration on the pen box project...) Link