ArcVieh

You can select images from media Library in the Widgets backend that will be shown on your Page. You can enter a size for the images.
The thumb-images will be linked to the full-sized-image. 
Requieres PHP 5!

Media Images Widget

Requieres PHP 5! You can select images from media Library in the Widgets backend that will be shown on your Page.

Daniel Bozo

When you edit an uploaded image in the media library you won’t be able to applies your changes to the new additional image sizes, and the post thumbnail. This plugin solves that problem.

Diamond Image Size Fix

When you edit an uploaded image in the media library you won't be able to applies your changes to the new additional image sizes, and the post th …

Media Images Widget vs Diamond Image Size Fix