For T3 Bases template, to allow randomly change the theme options, this will help.

T3 Theme random preview

# T3 Theme random preview
### For T3 Bases template, to allow randomly change the theme options, this will help.
#### Session has been used to keep the selection.

Opne your templates root folder and open `index.php` file and find this line:
```php
$t3app = T3::getApp($this);
```

Add these codes after that:
```php
// addition for demonstration
$input  = JFactory::getApplication()->input;
$session= JFactory::getSession();
$theme = $input->get('theme', $session->get('theme'));
$params = $t3app->_tpl->params;
if(!empty($theme)){
	$params->set('theme', $theme);
	$session->set('theme', $theme);
}

```