CSS Metallic Background
Metal Background with CSS3 Radial Gradients made by Adam Snodgrass. The first example is the basic metallic background. The second example is almost same, but has a fading effect towards both the edges. There's nothing too complex here, just usage of multiple radial-gradient with a particular background-size and background-position for each of them. The backgrounds gets repeated by default that leads to repeating radial gradients.