Today, we are happy to feature a useful icon set, the Simple Icons by Dan Leech. Dan’s set contains 100 PNG icons for popular websites, apps and organizations, all in eleven sizes (16, 24, 32, 48, 64, 128, 256, 512, 1024, 2048 and 4096 pixels squared). The white icons have transparent backgrounds, which makes them simple to style with CSS. As a bonus, simpleicons.org maintains a list of official background colour values that can be used in conjunction with the icons, thoroughly researched and derived from official branding guidelines of each brand.