Like all trends, they come and go but right now "Flat" is the new hottness. So with that said, here is a nice freebie set of long shadow flat UI for your pleasure.
// DOWNLOAD here //
According to Sigma, this is the World's first lens offering an aperture of f1.8 throughout the zoom range. This for DSLR camera's that have the APS-C format. I'm not usually a third party lens guy but this one seem very intrigue. Head over to the link for more information.