Since I made these kinda envelopes already before I had a template which I used to draw the envelope on one of the old maps, cut it out and glue it together.
For the card a template needed to be made and I choose to make a circle-card.
Here you can see two cards, one on the inside and one on the outside. For each card I choose a map which has on one side the blue of the sea because on this side the message can be written while on the outside again a part of a map is given.
A lot of fun doing it and this way a lot of paper can be recycled.