Icons are a resource that never hurts to have. I personally have a folder that I have called "Clipart" where I keep all the resources that I am downloading: brushes, shapes, vectorized images, icons, photographs, sources, etc.… and there I have a good collection of icons on dozens of themes and characteristics that I am collecting in my “walks” on the web.
Here I bring you more than 70 icon packs of very various aesthetics and features, some are ideal for customize folders and others to use in web design, but if you take a ride, you will surely end up downloading one of these packs.
Source | More than 70 free icon packs