If you need some flat design ideas, try out this Dislike SVG icon. Don't hesitate to get this flat icon for free, import it in Adobe Illustrator and start creating new creative icons.
You have the download buttons bellow and can choose between two popular extensions, SVG or PNG formats. Also, before downloading the Dislike 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