Basically it is a grid of 9 rectangles, connected creatively through the use of ribbon. The 9 spaces fold up to 5, then up to one. And, it is double sided. It could hold 18 cards/envelopes but I kept the center space of one side empty so I could decorate it as a gift.
Here is a photo of it all laid out:
It looks like this when it is all folded up:
The individual card holders are made using 2 pieces of chipboard, eventually glued back to back, but they sandwich a section of ribbon. Then I cut 1/4" square balsa wood and put it on 3 sides of each holder. I then placed a piece of a transparency (window sheet) to the top with a notch in it to make removing the cards easier. The balsa wood means it is not heavy, but I had to use 1/4" to make each holder able to hold two cards with their envelopes. This card holder is designed to hold the smaller (A2) 4 1/4 x 5 1/2 cards - and they must be flat.
Both of these conditions were hard for me - I like "lumpy" cards with ribbons and pop-dots - and I usually design in the 5 x 7 size.
Anyway, I will be posting each card over the next 17 days --- and then she asked for some thank you cards as I was putting this project together - so there are "extra" cards that I put on top and then I tied it all up with another length of ribbon.