Kailey (trepmal)

The ability to select an image from the media library as the background is baked right into core now. This plugin will no longer be developed.
Add an action button to images in the media library. Easily use any image as your custom background.
Custom backgrounds must be enabled on the active theme

Get Background From Library

(No longer in development.) Add an action button to images in the media library. Easily use any image as your custom background

WordPress.org

Nick Halsey

This plugin is a WordPress core feature-plugin that adds cropping to background images for parity with header images. For this particular feature the implementation is quite simple, but it’s starting out as a plugin to gauge user interest in this feature and whether the feature improves the user experience of background images.
This plugin requires WordPress 4.3 Beta 3 or later.
If you’re interested in contributing to this project, ping @celloexpressions on <a href="https://chat.wordpress.org/" rel="nofollow ugc">WordPress core Slack</a>. Please comment on the trac ticket with ideas and feedback: https://core.trac.wordpress.org/ticket/32403.

Background Image Cropper

Easy too use and i hope to see this plugin have an editor image while cropping images.
Thanks

Hope to see more option with editor

This plugin is a WordPress core feature-plugin that adds cropping to background images for parity with header images. For this particular feature the  …

Get Background From Library vs Background Image Cropper