\documentclass[12pt,a4paper]{report}
\usepackage[T1]{fontenc}
\usepackage[latin1]{inputenc}
\usepackage{graphicx}

\renewcommand\includegraphics[2][1]{% % only for demo
    \ifnum#1=1\rule{2cm}{2cm}\else\rule{3cm}{5cm}\fi%
}

\begin{document}
This \TeX{} is only for demonstration here and can be replaced when
inserting real images.

\bigskip{}
\begin{minipage}[c]{0.30\columnwidth}%
    \centering
    \includegraphics[1]{any file}
\end{minipage}%
\hfill{}
\begin{minipage}[c]{0.30\columnwidth}%
    \centering
    \includegraphics[1]{any file}
\end{minipage}%
\hfill{}
\begin{minipage}[c]{0.30\columnwidth}%
    \centering
    \includegraphics[1]{any file}
\end{minipage}\\[0.25cm]

\begin{minipage}[c]{0.30\columnwidth}%
    \centering
    \includegraphics[1]{any file}\\[0.25cm]
    \includegraphics[1]{any file}%
\end{minipage}
\hfill{}
\begin{minipage}[c]{0.30\columnwidth}%
    \centering
    \includegraphics[2]{any file}
    \end{minipage}%
\hfill{}
\begin{minipage}[c]{0.30\columnwidth}%
    \centering
    \includegraphics[1]{any file}\\[0.25cm]
    \includegraphics[1]{any file}%
\end{minipage}\\[0.25cm]

\begin{minipage}[c]{0.30\columnwidth}%
    \centering
    \includegraphics[1]{any file}%
\end{minipage}%
\hfill{}
\begin{minipage}[c]{0.30\columnwidth}%
    \centering
    \includegraphics[1]{any file}%
\end{minipage}%
\hfill{}
\begin{minipage}[c]{0.30\columnwidth}%
    \centering
    \includegraphics[1]{any file}%
\end{minipage}%

\end{document}