Randomize CSS plugin can be configured to randomize part of the css on each page view. It can for example change random colors.
Plugin Tag: randomize
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Random File
Retrieve the name, path, or link to a randomly chosen file or files in a specified directory.
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PiwigoPress
From any open API Piwigo gallery, swiftly include your photos in Posts/Pages and/or add randomized thumbnails and menus in your sidebar.