This was done for a card exchange. I got the idea from Craft Warehouse where they used a envelope for the card. You slip a gift card behind the bubbles. Well I didn't like the look on the inside so I changed it. And this is how it came out.
This is the inside of the card. I took a piece of card stock 5 1/2 by 9 inches and scored it center both length and width. Cut out the bottom left side after scoring it. Before folding the bottom right side up, cut off about
1 inch off and then use a punch to decorate it. Fold that right bottom piece up and glue the edges down . Do not glue the top( that's so you can put a gift card in it).
On the front I use foam mounting on the corners so I could slip a ribbon through it to tie it shut.