Changing default file icon

I changed the default application association for a mimetype that was wrong just editing the file .local/share/applications/mimeapps.list.

Just doing this was not sufficient to change also the default icon, so how can i set that the default icon for this type of file should be a .png in my home? (I can move it anywhere)

Right clicking on one of them and change the icon just change the one of that specific file, not for all the others with the same mimetype.

Solution 1:

There is a nice tool that may be handy for globally changing the icon for a specific file type.
Install it by executing: sudo apt-get install assogiate.
After installing you can run the tool (assogiate), seek for the file type, double click on it and change the default icon.
New icon should the be applied to all files of the specific mime type.

Screenshot: