If you need some flat design ideas, try out this Circular number eight SVG icons. It's easy to download and even easier to use, moreover, you can edit this icon with Adobe Illustrator or any other vector related software.
You have the download buttons bellow and can choose between two popular extensions, SVG or PNG formats. Also, before downloading the Circular number eight SVG icon, you can try the colors from the top of the icon, and test it, if the color fit with your ideas. If not, just refresh the page and you'll have new posibillities