Probably the easiest way to ornate your LaTeX documents with color is to use either the color package, or its enhanced version—xcolor. The documentation of the former one can be found here, and of the latter one here. And—traditionally—here’s a small example.
\documentclass{article} \usepackage{xcolor} \begin{document} \pagecolor{green} \color{blue!25!green} This is a terrible thing to \textcolor{red}{read}! \end{document}
The documentation contains also a few examples (in the Introduction) of how to mix colors (here, we have a mixture of 25% blue and 75% green, for example).