\documentclass[12pt,a4paper]{article}
\usepackage[usenames,dvipsnames]{color}
\usepackage{multicol}
\pagestyle{empty}
\setlength{\parindent}{0pt}

\newcommand{\SC}[1]{%
	\textcolor[named]{#1}{\rule{10mm}{10mm}}\quad
	\texttt{#1}\strut\\}

\begin{document}
\noindent 
\begin{multicols}{3}
\SC{GreenYellow}   \SC{Yellow}       \SC{Goldenrod}
\SC{Dandelion}     \SC{Apricot}      \SC{Peach}
\SC{Melon}         \SC{YellowOrange} \SC{Orange}
\SC{BurntOrange}   \SC{Bittersweet}  \SC{RedOrange}
\SC{Mahogany}      \SC{Maroon}       \SC{BrickRed}
\SC{Red}           \SC{OrangeRed}    \SC{RubineRed}
\SC{WildStrawberry}\SC{Salmon}       \SC{CarnationPink}
\SC{Magenta}       \SC{VioletRed}    \SC{Rhodamine}
\SC{Mulberry}      \SC{RedViolet}    \SC{Fuchsia}
\SC{Lavender}      \SC{Thistle}      \SC{Orchid}
\SC{DarkOrchid}    \SC{Purple}       \SC{Plum}
\SC{Violet}        \SC{RoyalPurple}  \SC{BlueViolet}
\SC{Periwinkle}    \SC{CadetBlue}    \SC{CornflowerBlue}
\SC{MidnightBlue}  \SC{NavyBlue}     \SC{RoyalBlue}
\SC{Blue}          \SC{Cerulean}     \SC{Cyan}
\SC{ProcessBlue}   \SC{SkyBlue}      \SC{Turquoise}
\SC{TealBlue}      \SC{Aquamarine}   \SC{BlueGreen}
\SC{Emerald}       \SC{JungleGreen}  \SC{SeaGreen}
\SC{Green}         \SC{ForestGreen}  \SC{PineGreen}
\SC{LimeGreen}     \SC{YellowGreen}  \SC{SpringGreen}
\SC{OliveGreen}    \SC{RawSienna}    \SC{Sepia}
\SC{Brown}         \SC{Tan}          \SC{Gray}
\SC{Black}         \SC{White} 
\end{multicols}
\end{document}
