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CSS3 Background Gradient Animations
Animated Background
Subtle animated background
Animated Background Image On Hover
Kudos
full(y) animated background
terrain-generator-canvas
Blobby Background
button animation background
Random Animated Background
CSS Animated Background Gradient
Animated background
Shapes squirt animation | Triangle-Circle-square
Everything "random()" :P
Method 4: stackoverflow.com/questions/17456935/how-to-create-a-button-with-a-css-animated-background
Login animation background
Animated backgrounds on hover
Proof of concept: Animated Background Gradient
CSS Animated Icomoon fonts
Animated Background Gradient
Animated Background Image