Here is a cool dark user interface with blue lights containing bottons, toggles and other web elements. A free PSD designed by Ariel Verber.
Flat UI Free is an awesome HTML UI kit containing a lot of useful web elements for your web projects. It has been made with Bootstrap.
Free PSD & HTML Flat UI kit
Free super flat UI kit containing several web design elements (video players, forms, buttons, etc.). Free PSD released by Riki Tanone.
Free PSD flat UI kit
Beautiful UI Kit for designers featuring the flat design trend. Square UI is a PSD User Interface Pack including beautiful components.
Free PSD square UI kit
This free PSD is a set of dark audio UI elements that can help you prototype some nice designs for your music related apps or websites.
Dark music interface free PSD
Here’s a free PSD containing the full concept of a mail app user interface. Designed by Aleksandar Djuric.
Free PSD mail app GUI
Free PSD UI of an incoming Skype call window designed by Giorgio Pia. It contains a small avatar and buttons for answering/closing the call.
Skype call UI PSD
User interface of Microsoft Surface RT device. Free PSD and AI vector files designed by Erik K. They are really well made!
Microsoft Surface RT UI PSD
UI kit on leather texture. Free PSD containing three buttons, one app icon, zip chain, and some UI elements that you can freely use.
Leather UI kit PSD
Today on 365psd there’s a free PSD containing a basic transparent UI kit with buttons, toggles, alert messages and a media controller.
Transparent UI kit PSD
Metrostyle Web UI is a modern interface that adapts to any web using standard components and its 5 different color combinations. Free PSD.