Finding for a free icon, then Set Colorful Ficons Icons +10 is is perfect one to get started. Treat yourself to this collection of Free Set Colorful Ficons Icons +10 that you could use for your apps or web projects.
Download free flat icon set file and use it as you wish to use it. This freebie has been provided by Dribbble.com.
If you want more icon, you can check the Free Icons.