Anil Sardemann

This plugin distinguishes between block and non block themes to add a fullscreen background image to WordPress. It is set either to the body tag (in case of a non block theme) or to the wp-site-blocks class (in case of a block theme). Upload an image or choose one from your media library. Simple plugin that allows you to set a background image for your website easily.
<a href="https://playground.wordpress.net/?plugin=custom-background-image" title="WordPress Playground Demo" rel="nofollow ugc">Demo</a>

Custom Background Image

Simple plugin that allows you to set a background image easily. Upload an image or choose one from your media library.

taniafi786

A small WordPress plugin allows you to automatically change the wallpaper(morning,evening) according to server daytime.
<ul>
<li>
get server time by using 
$Hour = date(‘G’);
</li>
<li>
for morning image/wallpaper : $Hour >= 5 && $Hour <= 18
</li>
<li>for evening image/wallpaper : $Hour >= 19 || $Hour <= 4 </li>
</ul>
**You can change the hour value and images

WallpaperChanger

A small WordPress plugin allows you to automatically change the wallpaper(morning,evening) according to server daytime.

Custom Background Image vs WallpaperChanger