I read that the the artists will depict their national flags in different ways.
3 Postcards were shown in Amsterdam but I guess there is no video for that.
Got that Quote from Wiwibloggs.com:
We also had the chance to preview three postcards: from Austria, Finland and the Netherlands. As in Sweden the postcards offer us a glimpse into the lives of the contestants, but they are more colorful and vibrant.
In Austria’s we see Conchita pushing a rack of red and white dresses through the snow to the Opera House. She arranged them and they eventually form the Austrian flag. Finland does this with a block of ice on a boat, and Holland does this with flowers on a boat in an Amsterdam canal. They are lovely and the theme music is great