This is the inside of the card, simple in design, showing the pocket on the left.
Right, on with the card base tutorial.......................
You can use any size envelope, either rectangular or square, they all work. The only problem with this is that the 'card' won't fit in an envelope.
Start by laying out the envelopes as shown below.
Take a sheet of patterned paper and cut two pieces just smaller than the envelope and stick onto the front and back of the envelope card, leaving the inside with the open pocket uncovered.
With a sheet of co-ordinating paper, cut two more pieces to fit the inside of the card and stick one inside, over the right side of the card. (the side without the pocket).
Find the centre of the other piece of patterned paper and pund half a circle as shown. Turn it over and add narrow two sided tape to the 3 straight sides only.
Then add glue stick over the remaining white part of the envelope, not onto the chalked inside area, as this will need to open as a pocket. Sorry forgot to rotate the photo.