This would make a great little gift for a friend or co-worker. Here's the directions I got from a fellow SU! Demonstrator, Rebecca Rodriguez.
Score the 11"x 4-1/4" cardstock @ 2-3/4 & 5-1/2" , then fold.
Score a 2" x 2-1/2" piece of cardstock (this is what will hold the pen) @ 1/2", 1", 1-1/2" & 2", then fold to create the pen holder. Tape it together with sticky strip. Then, add one piece of sticky strip to the back & bottom of the pen holder.
Give it a try. It's pretty easy. I put matching Designer Paper inside a see-through pen.