Here is a how to.
I used a very sturdy styrofoam. I draw the letters on it, cut them out, sanded the edges (they are still far from perfect but it is ok) and painted the letters with wall paint. I mixed the color from the white and sunny yellow that I already had.
Let it dry - it takes a few days and hang it. Tada!
If anyone wants a sign like this, let me know. We can work something out:-) (vsakih 7 crk, 5 EUR, barva 10 EUR + 20 EUR delo):-))))