I assigned all of my commenters a number, and then used a random number generator to choose the winners.
In the order in which their numbers came up, the winners are:
Kirsten, who wins the purple pen.
Christine, who wins the blue pen.
Melissa, who wins the red pen (since Kirsten wanted the purple).
Please email me your addresses at severuslupus AT gmail DOT com and I'll get your pens in the mail!! Congrats, ladies!!! And thanks to everyone who commented. There will be more giveaways from the Big Box O' Pen Love.