Free Icon Images
Some great free icon images, "128 carefully drawn illustrations of all kinds of pretty things around us — a bike, birthday cake, watch, traffic light, game console, doughnut, speaker, rollerskate, starship and much more. You may freely use it for both private and commercial projects, without any restrictions, including for software, online services, templates and themes." Download the full set here and read more here.
Also see https://www.iconfinder.com/ and http://www.iconseeker.com/ source - tips make your own gorgeous infographics