Smileys in LaTeX
For the sake of completeness (see also https://tex.stackexchange.com/a/59125/83):
Unicode defines codepoints of the various emoticons/emojis: There is ☺ and ☹ at U+263A and U+2639, and there are many more from U+1F601 onward. So, all you need is a font that includes these characters (DejaVu Sans contains some of them, and there are other fonts with full emoji support), copy&paste your emojis, and use XeLaTeX or LuaLaTeX. E.g.,
% Compile with xelatex or lualatex and DejaVu Sans installed on your system.
\documentclass{article}
\usepackage{fontspec}
\newfontfamily\DejaSans{DejaVu Sans}
\begin{document}
Some emoticons from Unicode:
{\DejaSans ☺☹} and even cats: {\DejaSans }!
\end{document}
Package tikzsymbols provides some symbols as well. As usual with tikz, you can apply scale and color changes.
\documentclass{article}
\usepackage{tikzsymbols}
\usepackage{textcomp}
\usepackage{parskip}
\begin{document}
This is Max \Strichmaxerl and this is Jane \Strichmaxerl. The met
over a \Coffeecup of nice and tasty coffee. Later they went for
a \Candle-light dinner. Their love for each other was burning
like \Fire and he asked Jane to \textmarried{} him.
He was a bit \Sey[][green!60!white] on his wedding day and had to \Chair
down. His best man told him to be \Cooley and that everything is
going to be just fine with the \Winkey of an eye.
All guests were waiting for the famous words of the \Innocey: You
may now kiss the bride.
Everybody was very \dSmiley at the reception. Bride and groom were
very excited \Laughey[1.4] thinking about their honeymoon, which they
planned not only to be staying in \Bed sleeping in ;-)
\end{document}
bclogo offers these:
(from the manual)
This, however, doesn't work with pdfTeX because the package uses pstricks.
Generally, I recommend you look for some smileys that you like on the web and then put them in your document via includegraphics{}.
Addition:
marvosym also offers two smileys:
\documentclass{article}
\usepackage{marvosym}
\begin{document}
\Smiley{} \Frowny{}
\end{document}
