I managed to edit the plugin to toggle the star image from yellow to grey. Here's the crude, but working hack:
1. Create star-grey.png image by desaturating the provided star.png image.
2. Add the following function:
function wpfp_before_link_img_grey() {
$options = wpfp_get_options();
$option = $options['before_image_grey'];
return "<img src='". WPFP_PATH . "/img/star-grey.png' alt='Not Favorite' title='Not Favorite' class='wpfp-img' />";
}
Note it skips the options variable for now.
Added the following code to the main wpfp_link function:
[Code moderated as per the Forum Rules. Please use the pastebin]
This seems to work really well once the Show remove link and Show add link functions are enabled on the plugins admin page.
Next up, create a downloadable version of the favorites list. Thanks Huseyin for a great plugin.