Radialslider - Anton Kudin Had an idea of this bit of touchscreen UI. Could be a bit more useful than a knob.
Share Button - After Effects Project file by Jelio Dimitrov
Buttons And Switches(PSD) dload link: http://dribbble.com/shots/797923-Buttons-And-Switches-PSD/attachments/81063
Nice UI button
game icon and button design on Behance
Switch Button by Javi Perez via Dribbble