A simple plugin extension that can be used with the Featured Image Thumbnail Grid Plugin to create a grid with thumbnails that have rounded corners. This extension is based on this excellent article on Whole Reason. You must have version 3.0 of the Featured Image Thumbnail Grid for this extension to work.
Install this plugin using the built-in plugin installer:
Go to Plugins > Add New.
Under Search, type “Featured Image Thumbnail Grid”
Click Install Now.
A popup window will ask you to confirm your wish to install the Plugin.
Click Proceed to continue with the installation. The resulting installation screen will list the installation as successful or note any problems during the install.
If successful, click Activate Plugin to activate it, or Return to Plugin Installer for further actions.
Download the plugin by clicking on the link below:
In the WordPress admin panel, click on Plugins. Select Add New to get to the “Install Plugins” page. Click on browse and choose the downloaded file.
Click on the “Install Now” button to install the plugin. Once the plugin is installed, select “Activate Plugin”.
Method 3: (Advanced Users):
Unzip the file. Using FTP, upload the thumbnailgrid folder to the contents/plugins folder in your wordpress directory.
[thumbailgrid rounded="TRUE" cat="41"]