Hi. Thanks for contributing to the WordPress community.
Your plugin works but I have three issues.
1) The icon to the left of the Menu Item on the Dashboard doesn't have an Icon, so I get the blank image type icon. Attempting to save the picture, it suggests a name of "application_side_boxes.png" but it doesn't exist. Maybe I could uninstall and reinstall?
2) My installation doesn't look like this: http://otwthemes.com/wp-content/uploads/2012/08/2.get-shortcode.png . In other words, the Example shortcode isn't shown, like it is on the bottom of your graphic. I'd like to be able to copy and paste the shortcode instead of guessing what it might be.
3) Finally, I can't get it to work on the Homepage of the FIGERO theme. Maybe I could use some PHP instead but I'm not sure how to use your PHP (of where to put it inside the FIGERO theme :)