This is amazing campaign of FSFE
If you want to participate in the campaign, you can order promotion materials on FSFE site for free, but I had no time to do this.
I’m postcrossing user. So I decided to support the campaign with postcards. Unfortunately there is only one type of postcards available on the FSFE site. Therefore I made another four postcards based on other FSFE promotion materials (flyer, posters, sticker). All images are made for the same size 141 mm x 100 mm. This makes possible to place four postcards on standard A4 page.
You can download images here:
All these images are available under the same licence CC0 as original sources.