This vector UI kit contains essential elements for wireframing web and mobile designs. They are perfectly suited to mocking up and planning design projects. The style is perfect if you are looking for a hand drawn, organic feel for your UI elements. These elements were created in Adobe Illustrator and the .ai file is completely editable including stroke widths and effects. (The .eps and .svg files are also editable but have some styles flattened to maintain appearance.)

https://creativemarket.com/Medialoot/47287-Hand-Drawn-Vector-UI-Kit