All you do is take a 8 1/2'' x 11'' sheet of cardstock, lay it out in landscape (wider side is horizontal). Score vertically at 5 1/2" and horizontally at 2". To make it fold easier, you can make a notch in the middle (see picture). You can also seal the edges of the pockets with tacky tape but it isn't necessary.
Note: This holder can hold 3 cards, envelope and a pen nicely.
Decorate the cover and cards to your liking!!