If you need some flat design ideas, try out this Navigation caret left SVG icon. You must follow the download button below and half of your work is done.
You have the download buttons bellow and can choose between two popular extensions, SVG or PNG formats. Also, before downloading the Navigation caret left 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