If you are looking for a royalty free icon, then Freebie: 16 Line Illustrations is ideal for you. The resource of the day is a Free Freebie: 16 Line Illustrations created to help you develop great UI projects.
Download flat icon free commercial use file and use it as you wish to use it. The PSD Mockup created by Dribbble.com.
If you want more icon, you can check the Free Icons.