Before After Plugin: Display before after effects with photos.
Before After plugin integrates jQuery Before/After Plugin in the wordpress.
It can be used to show the difference between edited and original photo, before and after photos of changes, etc.
Recent Photos Plugin: can be used to display recent photos from your media library in the sidebar.
Recent Photos Plugin provides with a widget to display n numbers of photos in the sidebar.
The display can be customized through custom css or integrated in main style sheet file of your theme. Plugin also provides an option to use Thickbox (along with the patch code necessary for running thickbox on wordpress).