Zhang Yiking of Kindesign is a Shanghai, China based graphic designer specializing in branding, icon design, and UI/UX design.
300 User Interface and Web Icons. Download here: http://graphicriver.net/item/300-user-interface-and-web-icons/14840175?ref=ksioks
Let me tell you about this design made for the Daily UI project. It's a simple UI of a Calculator App that offers you just what you need.