LaTeX is a great language for creating beautiful reports. Between LaTeX and knitr, I produce almost all my documents, whether notes or publications.
These two examples should show the breadth of my LaTeX abilities. The first includes LaTeX, Beamer and TikZ. The second is my curriculum vitae, which has been typeset in LaTeX.
This is a very minimal example, but it hits a lot of skills-- LaTeX itself, Beamer (for presentations), and TikZ (for graphics). It also shows off a little of my algebra prowess.
To follow the convention of this portfolio, my CV is available for download, but I am also making available the LaTeX code I used to write it