Flash Cards!
This set really is that simple. The measurements and styles are flexible--just go with the basic principles.
Pick your base card size (I used pre-made envelopes from my stash as a guide)
Pick your color scheme.
Cut bases.
Cut pocket papers the same height as the card base and slightly wider, then use craft knife to free-hand the pocket cut.
Attach pockets to base.
Insert tags, cards, die cuts, tea bags, book marks, gift cards or whatever catches your fancy.