Examples of powerful LaTeX packages and techniques in use — a great way to learn LaTeX by example. Search or browse below.

Example of inline and margin comments
Add inline or margin comments to LaTeX pdfs using the todonotes package.
Henrik Skov Midtiby

The tcolorbox Package
tcolorbox provides an environment for colored and framed text boxes with a heading
line. Optionally, such a box can be split in an upper and a lower part. The package
tcolorbox can be used for the setting of LaTeX examples where one part of the box
displays the source code and the other part shows the output. Another common use
case is the setting of theorems. The package supports saving and reuse of source code
and text parts.
Thomas F. Sturm

Branching arrows with decision option in flowchart
Branching arrows with decision option in flowchart
Example from LaTeX-Community.org

Map of scientific interactions of researchers affiliated in 2008 to the J.-V. Poncelet laboratory
Map of scientific interactions of researchers affiliated in 2008 to the J.-V. Poncelet laboratory

How to produce a list of prime numbers in LaTeX
How to produce a list of prime numbers in LaTeX

Research Diary - Example Entry
This is a template for keeping a digital Research Diary in LaTeX, with an example entry and placeholder for your university / institution logo.
Original version by Mikhail Klassen who describes his experiences using LaTeX for research note taking in this blog post.
Mikhail Klassen

Example: Custom Font
Example: Custom Font

Example of rotated text in LaTeX
A minimal example of rotated text in LaTeX. All you need is
\usepackage{rotating}
in the preamble, and
\begin{turn}{45}
...
\end{turn}
around the text you wish to rotate (in this case, by an angle of 45 degrees).
This example was originally posted at: http://texblog.org/2013/10/01/rotate-an-image-table-or-paragraph-in-latex/
Tom at TeXblog

Herschel enneahedron net
Herschel enneahedron net