Here's one of the best Thumbnail SVG icon template that you have ever seen. It's free to get this flat icon and save a ton of time, can also make your own design look better.
You have the download buttons bellow and can choose between two popular extensions, SVG or PNG formats. Also, before downloading the Thumbnail 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