Move Images Between Pages is a plugin by oddjar that allows you to quickly reattach images to different pages in your WordPress installation. It places a simple drop-down menu in the edit media screen that lists all of the pages in your WordPress site and allows you to reattach the given image to a new page.
Note that this plugin only works for images that are attached to pages. It ignores images that are attached to posts.
Download and info: http://wordpress.org/extend/plugins/move-images-between-pages/