Thanks,
That is not exactly what I meant. With this, you can add a section to every page and personalize it. But what I want to do is to personalize the layout.
In my case, that is the Main title of the page, a description (below the title) and a Photo. These three elements appear in every view, that is, belongs to the layout.
Haven't found a good way to do it yet. Just a workaround that works, but for sure is no the right way to do it:
I created a new Engine (customization), and create only one element in it. I get this element from the layout view and print the parts.
To edit from the backend, I changed the index view and just print the form (as with the show action), as I only need one element (I disabled the remove option, as it would break the layout).
As said,at least it works...
If anyone find a better solution please, let me know.