If you got a bit sick of flat design here is a simple on/off toggle provided in active, inactive and transition statuses by Barry Mccalvey.
Freebies tagged toggles
Here is a simple toggle switch with subtle shadows and details made with CSS. Released by CSSFlow.
Simple toggle switch CSS
Dark UI kit containing buttons, checkboxes, toggles, dropdowns, search fields, text fileds, sliders. Free PSD designed by Vinny Singh.