Automatically add black ribbon into sites corner (may be used for some purpose)
This plugin converts all images to grayscale and show the colored image on hover
Display mourning Black Ribbon at selected corner on every page of your website.
Automatically turn the site to grayscale (may be used for some purpose)
Change WordPress login screen to black color to make it more contrast.
This CJT extension plugin can easily convert any coloured image into a greyscale image.