What I came up with was the following:
1. The nice lady who works in my local grocery store (Bónus, Mosfellsbær) gave me 2 wooden, fruitboxes (appelsínukassa) for free... they would have landed in the garbage anyway - but I gave them a new live and a new purpose. I love that feeling!
2. an old, transparent plastic oilcloth
4. a stapling gun
What I did: (if you don´t understand a thing, just look at the pictures - you´ll see what I did with your own eyes :-)
I removed 2 of the longest, wooden side-boards from both boxes, the buttom of one and put them on top of each other. I used the long boards to fix the two boxes together (the long, vertical boards you see on the front side)
After that I painted the boxes with white paint I had at home.
To finish the whole thing I cut the oilcloth to pieces (1 long piece for 3 sides, 1 small for the buttom, 1 long one for the top and the front side) and fixed it with my stapling gun.