I really really like making icons, it allows me to relax when my two sons leave me alone (mostly when they sleep ^^). You can download them for free below, feel free to request your favorite one through github.
Flat OSX • Iconset
Thousands of flat Osx icon including file types, folders...View Icon set
Charavatar • Iconset & Avatars
Thousands of flat Super heroes and villains...View Icon set