We used the great paper from the Sweet Pea Designer Series Paper Stack. The pack is full of wonderful patterns and colors and is perfect for using to create the card organizer. We bound the finished pages into a wire-bound book so it can expand some to accomodate all the cards you are going to make to fill it with :~)
I will offer card classes throughout the year so you can build up your card supply and you can check my blog often for other ideas. I'm running a bit late getting my March classes posted. Frankly, Feb went by so quickly that March just slipped up on me when I wasn't paying attention! I'm working on some Easter projects and a card class. I'll get a picture of them posted as well as the dates of the classes soon.