Fotis wrote: It's fairly simple actually, but it does require that your create K2 template overrides so you don't lose your changes when you upgrade K2. More info on K2 overrides here: getk2.org/documentation/tutorials/174-templating-with-k2-and-the-concepts-of-sub-templates

Now, if you wanted to show a default image in the item view (in item.php) you could add this at the very top of the file:

<?php

// place the following after the "defined('_JEXEC') or die;" line
if (empty($this->item->image)) {
    $this->item->image = '/path/to/placeholder.jpg';
}

The above code will set a placeholder image when no K2 item image exists. You can follow the same pattern to set a placeholder for category views, modules etc.

Fotis wrote: An actual URL would also help...