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

Venn diagram with PGF 3.0 blend mode
With TikZ 3.0, there’s a new kind of transparency: you can use blend modes.
This short Venn diagram example shows how the screen blend mode can be used to create a clear visual effect with just a few lines of code.
Overall, there are 16 blend modes to choose from: normal, multiply, screen, overlay, darken, lighten, color dodge, color burn, hard light, soft light, difference, exclusion, hue, saturation, color, luminosity.
The code for this example was written by Paul Gaborit, published on TeX.SE and then on TeXample.net. This abstract is adapted from that on TeXample.
Source: http://www.texample.net/tikz/examples/venn-diagram-blended/
Paul Gaborit (via TeXample.net)

Venn diagram
A Venn diagram with triangles
Matt Stump

Package Example: wrapfig
Here we present a short example of how to use the 'wrapfig' package to automatically wrap text around a figure (including the figure caption).
The example shows left and right aligned figures with wrapped text, and is available to open as a template if you want to try it for yourself.
Overleaf / WriteLaTeX

How to make a colour theme changing class (Tutorial)
This is a document to practice tweaking a class file for the first time, using the example of setting up the possibility of changing the colour theme of the document.
The github to go with it is: https://github.com/latex-ninja/colour-theme-changing-class-tutorial-
It is a reference document for this blogpost.
Sarah Lang

Bibliography management: biblatex with biber backend
This document is an example of using BibLaTeX (with backend=biber) for bibliography management. This example was originally published on ShareLaTeX and subsequently moved to Overleaf in November 2019.
Uploaded from ShareLaTeX

Modified Friggeri CV
This is a CV based on the Friggeri CV template but has updated colors and sections styles
Yeshasvi Tirupachuri

EDV WS17/18 Abschlussbericht-Shazam Ali Shah
A report example in German
Shazam Ali Shah

Per-chapter bibliographies with BibLaTeX
This is not a full thesis template! It only demonstrates how to create per-chapter references using BibLaTeX. (Do not use with BibTeX nor \code!)
LianTze Lim (Overleaf)

aik-praca
Prosta praca naukowa
Robert Janusz