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The Observer design pattern is very common, and luckily is a very easy concept to understand.

The adapter design pattern is an easy to understand design pattern. Here is a guide (using PHP to help) to explain it all.

The decorator pattern explained

A simple to understand explanation and examples for the strategy design pattern (using PHP)

The Chain of Responsibility design pattern is gaining in popularity, since being part of the PSR-15 standard (HTTP Request Middleware). Here is a quick overview of it. It let's you chain actions, and often gives them the ability to stop the chain.

A simple to understand description of the Composite design pattern, using PHP.

The front controller is a simple to understand design pattern where you have a main controller that handles every request for a website. It is a commonly used design pattern for many MVC based web applications.

An introduction and easy to understand explanation of the Specification pattern, described using PHP.

An easy to understand description of the Repository Pattern in PHP, including generic examples and examples specific to Laravel.

A simple to understand introduction to the popular template method pattern.

An easy to follow explanation of the Service Locator design pattern, in PHP.

Adding a background image to a <div> (or any other tag) is easy using CSS. Use these example rules to get a nice gradient that goes over the top of a background image, without adding any additional divs. All in CSS.