Free awesome flat ui kit
Flat UI Pro is made on the basis of Twitter Bootstrap in a stunning flat-style, and the kit also includes a PSD version for designers. From $39. Learn More: http://designmodo.com/flat/
flat-UI-design-577x1024 Top Mobile App Design Trends 2015&2016, important visual elements for great UI
Flat UI. Free Web User Interface Kit
Flat UI Colors
Digital art selected for the Daily Inspiration #1986 I love the extension of flat UI design. this picks up on Google's Material Design ideas
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Flat Mobile UI Design with Remarkable User Experience | Design | Graphic Design Junction