Zion, named after my favorite national park, is an icon set designed to mesh with OS X Yosemite’s refined visual language. In Yosemite, toolbars have been simplified, favoring solid-colored circles for close, minimize, and maximize; windows and content feel lighter; and many frivolous elements like drop shadows and gloss have been scrapped. However, many of Apple’s own icons fail to reflect these system-wide UI changes, instead clinging to the realistic renderings of apps’ physical counterparts. Zion is meant to address these omissions, instill a system-wide consistency, and, most importantly, make our docks, folders, and desktops look a little more friendly.
~Alex Griendling, alexlikesdesign.com