How can put different watermarks on even an odd pages using draftwatermark

Question

How can I put different watermarks on even and odd pages using draftwatermark package?

Answer 1

The draftwatermark package doesn't directly provide an interface to do this, but it can be done without modifying the package internals at all:

\documentclass{article}
\usepackage{draftwatermark}

\makeatletter
\SetWatermarkText{%
    \ifodd\c@page
        Odd page
    \else
        Even page
    \fi
}
\makeatother

\usepackage{lipsum}
\begin{document}
\lipsum
\lipsum

\end{document}