Basically, you make a template from cardstock that you've covered with contact paper. I'm hoping there will be more options when strolling down the shelf paper aisle. *Fingers Crossed.
Then assemble with scrapbooking brads. Like snapping your fingers.
PS. Today, I found this excellent DIY book by Ellen Lupton, called D.I.Y.: Design it Yourself. ie. the instigator.