Randomize CSS plugin can be configured to randomize part of the css on each page view. It can for example change random colors.
More Plugins
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Remove WPMU Dashboard Install Nag
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Media Library Helper — Bulk edit image ALT, caption & description
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Rest Routes – Custom Endpoints for WordPress REST API
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Document Embedder – Embed PDFs, Word, Excel, and Other Files
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Live Chat (+ Chatbots) with Slack for WordPress
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Migrate Guru – Site Migration & Cloning
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My Tickets – Accessible Event Ticketing
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WP Snow Effect
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List Pages Shortcode
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Classic Editor +
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Coupon X – Discount Popups, Promo Codes Pop Ups for WooCommerce & Announcement Popups
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Better YOURLS
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Flag Icons
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A faster website! (aka defer.js)
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Frontend Dashboard
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Quads Ads Manager for Google AdSense
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Editorial Calendar
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Einsatzverwaltung
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Unique Headers
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WP Simple HTML Sitemap