\documentclass[12pt]{article}
% options include 12pt or 11pt or 10pt
% classes include article, report, book, letter, thesis

\title{This is the title}
\author{Author One \\ Author Two}
\date{29 February 2004}

\usepackage{pstricks}
\setlength{\textheight}{12.5cm}
\setlength{\textwidth}{16.0cm}

\newcommand{\cloud}[1]{
  \psset{unit=#1cm}
  \pspicture(2,4)
  \psarc(2,0){1.25}{210}{35}
  \psarc(0,0){1.25}{105}{320}
  \psarc(0.2,.75){.75}{45}{145}
  \psarc(1.8,.5){1.15}{5}{150}%
  \endpspicture
  }

\setlength{\parindent}{0mm}
\setlength{\parskip}{5mm}


\begin{document}
\maketitle

This is the content of this document.

This is the 2nd paragraph.
Here is an inline formula:
$   V = \frac{4 \pi r^3}{3}  $.
And appearing immediately below
is a displayed formula:
$$  V = \frac{4 \pi r^3}{3}  $$

This is a cloud size 0.3: ~ ~ ~ ~ ~ \cloud{0.3}

This is a cloud size 0.9: ~ ~ ~ ~ ~ \cloud{0.9}

\end{document}