The HUD Circle skin for Rainmeter is simply an animation circle that brings some special effects on your desktop. It is simply a great way to light up your computer screen. To toggle the animation off/on, all you need to do is left-double-click. You can also right click to choose whatever color you want to have on the circle. And what’s more, the skin has options that can allow you to change the animation speed, either to higher or lower value.