Those sources were usually used only by professional designers with lots of knowledge and it was difficult for those who are not experts in this field to create an icon. Nowadays there are many ways for designers as well as designer enthusiasts to design an icon. With their help you can find an image that you like online and try to edit it in order to get an interesting icon. It is a small and very easy to use tool for icon editing, making, altering, searching and even exploring.
Free download for Windows and Mac!