I finally came up with a system for my card stock scraps. I bought twelve 3-drawer containers from Wal-Mart. In each drawer, I put a divider I made from two sheets of Wal-Mart white card stock scored and glued together.
Small Workshop Storage Solutions: Eke out every cubic inch of storage in a basement shop with pivoting boxes that hang between the ceiling joists. http://www.familyhandyman.com/workshop/storage/small-workshop-storage-solutions/view-all