3D effect like "safari new tab page" on iOS

I would like to develop an iPhone/iPad 3d interface like the "Safari browser new tab page" ( a screenshot here ).

The tricky part is to display the images in a non rectangular zone. As you can see, the images are displayed in a curved zone. Hence my ques开发者_Go百科tion, what is the easiest way to do it ?

I am thinking about doing it with OpenGL. In this case each picture would be a texture that is applied in a 3d discretized curve. Do you think that can fill the bill ?

What's more, I'am asking if there is not a tip to do it only with 2D rendering... that could be easiest to implement.

If anyone has a comment or an idea, you're welcome ;)