There are a number of sources of public domain images on the Web.
The presence of a resource on this list does not guarantee that all or any of the images in it are in the public domain: you are still responsible for checking the copyright status of images before you submit them to Wikipedia.
Here are some Color combinations that will help you in designing on the web.
The Color combinations are displayed along with hexadecimal color code so that you can pick the color quickly.
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