\documentclass{oblivoir}
\usepackage[x11names]{xcolor}
\usepackage{arrayjob}
%%% hoze's sample
\newarray\PagetabColors
\readarray{PagetabColors}{red&orange&yellow&green&cyan&blue&violet&lightgray&darkgray&black}

\usepackage[first=1,last=10]{lcg}
\usepackage{multido}

\begin{document}

\noindent\multido{}{10}{%
\rand\arabic{rand}
\checkPagetabColors(\therand)
\textcolor{\cachedata}{What color?}
}

\end{document}