Was inspired after seeing Mail.Ru's post but pictured it with parallax and a more interactive feel. Mail can be fun =] And the clouds definitely were a good start.
Hard to see the texture details in the small gif (and at 150% speed).. check the attached movs for the real deal.
I thought it would be really cool if the login fields were floating slightly above the paper background texture. There's a slight bit of parallax (think ios7 home screen). Enough to be barely visible. When you tap on any of the fields or buttons, they depress according to where you tap.