\documentclass{article}

\usepackage{xecolor}
\usepackage{pgffor}

%\usepackage{xepersian}
%\settextfont{Yas}

\begin{document}
\foreach \x in {red,yellow,green,brown,black,blue,cyan,magenta}
    {\x : \textxecolor{\x}{xecolor}\par}
\end{document}