grigori991

Plugin registeres simple widget within wordpress blog, that allows any visitor to change background 
color of theme. Actually it doesn’t change theme’s css file, but renders some style tag to user 
browser, that change the color locally. 
New background color associates only with user, that setted the color, and it tracks from cookie. 
So, if first visitor sets background color to ‘Rose’, second visitor can choose ‘Lime’ and third can 
leave that attribute to default and everyone get what they want at same time. 
If blog visitor sets background color to ‘Default’, browser explicitly deletes the cookie. Otherwise, 
cookie deletes itself after 30 days. 
Widget uses 4 ‘web-safe’ colors – #00FF00 (lime), #00FFFF (bluegreen), #9933FF (violet) and
FF0033(rose).

BGColor Setter

BGColor Setter plugin sets up the widget, that allows any visitor of blog to dynamically and graphically change the background color.

markoarula

With this plugin you can enable your users to switch website between Night Mode and normal style smoothly to improve the readability of text, images and videos.
Reading website content at night time can be difficult. Help your visitors read more articles, spend more time on your website and protect their eyes from being hurt.

WP Night Mode

Allow users to change the website style while reading at night, enabling them to easily read and spend more time on your site.

BGColor Setter vs WP Night Mode