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A plugin offering a widget showing recent photos in posts. It can be configured 
as for how many photos to show, the title on the widget and max width and height for 
thumbnails.
The thumbnails links to the post where the photo is showing. They show a mouse over 
effect with bigger version of the photo in a tooptip.
It has option to exclude photos from the view.
It has only been tested with WP 4.2, it might work with lower versions.

Recent photos widget

A simple widget which shows thumbnails of latest photos in posts

Hemant Nandrajog (instruite)

Recent Photos Plugin provides with a widget to display n numbers of recent photos from the media library in the sidebar. 
The display can be customized through custom css or integrated in main style sheet file. 
Also provides an option to use Thickbox (along with the patch code necessary for running thickbox)
Demosites:
<a href="http://playground.instruite.com/" title="Operation with Default wp theme" rel="nofollow ugc">Operation with default theme</a>
<a href="http://www.instruite.com/" title="Example of how widget can be customized" rel="nofollow ugc">Customized Version</a>
Author info:
Follow me on <a href="http://twitter.com/instruite/" title="Follow instruite on twitter" rel="nofollow ugc">Twitter</a> or become my Friend on <a href="http://www.facebook.com/instruite/" title="Instruite's Facebook page" rel="nofollow ugc">facebook</a>
<h4>Configuration Options</h4>
<ul>
<li>Title: Title for the widget will be displayed as per your theme</li>
<li>Number of the photos: Number of photos that will be displayed in the sidebar</li>
<li>Randomize: Check to display photos in random order</li>
<li>Browse Photo Link: Full link to your photos/gallery page 
 Leave blank if you don’t want to show the link.</li>
<li>Use Thickbox: Enables/Disables the use of thickbox for this widget </li>
<li>WordPress Path: Applicable only if Thickbox is enabled 
 This option is necessary to provide the patch for thickbox to correctly display thickbox related images 
 (loadinganimation and close). If your wordpress installation is in a subdirectory provide the path for the same 
 followed by a forward slash 
 Eg. wordpress/ 
 When the WP installation is in ‘wordpress’ subdirectory</li>
<li>Use Custom CSS: Enable/Disables the use of Custom CSS</li>
<li>Custom CSS: For styling this plugin requires following CSS ids and classes to be defined 
 #recent_photos_envelope{margin:0 0 30px 0;} 
 .recent_photo_image a {float:left;display:inline;margin:0 16px 15px 0;border:1px dashed #888;padding:5px} 
 .recent_photo_image a:hover {border:1px dashed #000} 
 The above css code is default css provided with the plugin</li>
</ul>

Recent Photos

Recent Photos Plugin provides with a widget to display n numbers of recent photos from the media library in the sidebar.

Recent photos widget vs Recent Photos