Here's a very basic approach:
\documentclass{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\shade[left color=gray!50,right color=gray!50,middle color=black!55,rounded corners]
(-3.4,-5.25) .. controls (0,-5.13) .. (3.4,-5.25) -- (3.4,-4.98) .. controls (0,-4.98) .. (-3.4,-4.98)-- cycle;
\fill[gray!60,rounded corners]
(3.6,3.3) .. controls (3.74,4.8) .. (3.76,4.9) -- (3.4,4.95) -- cycle;
\node[fill=gray!15,rectangle,rounded corners,text width=7cm,text height=10cm]
at (0,0) (sh) {};
\end{tikzpicture}
\end{document}

\includegraphics{thiseffect}... What have you tried, how and for what do you want to use it, where are the difficulties? – doncherry Sep 5 '12 at 21:21