Si potrebbe definire un comando apposito, per esempio:
`\documentclass[a5paper]{article}
\usepackage{tikz}
\usetikzlibrary{calc,backgrounds}
\usepackage{pdfpages}
\def\foldedpageside{5em}
\def\foldedpagecorner{0.25}
\newcommand\insertfoldedpage[2][]{%
\begin{tikzpicture}[inner sep=0pt, radius=\foldedpagecorner*\foldedpageside]
\node (foldedpage) {\includegraphics[#1]{#2}};
\begin{scope}[on background layer]
\draw[fill=cyan!10]
($(foldedpage.north east)-(0,\foldedpageside)$)
arc[start angle=0, end angle=45] coordinate (b)
arc[start angle=45, end angle=90] -|
($(foldedpage.north east)-({(1-\foldedpagecorner)*\foldedpageside},
\foldedpagecorner*\foldedpageside)$)
arc[start angle=0, end angle=45] coordinate (a)
arc[start angle=45, end angle=90] —
(foldedpage.north west) — (foldedpage.south west) —
(foldedpage.south east) — cycle;
\draw[fill=cyan] (a) — (b);
\end{scope}
\end{tikzpicture}%
}
\begin{document}
\insertfoldedpage[width=0.8\textwidth]{esempio.pdf}
\end{document}`
