These are my photos from parks I have visited (I didn't take them, they are all from Wikimedia Commons).

This shows you how to make a simple image gallery using articles in com_content.

In each article put a thumbnail image before a "readmore" and the full size image after it. Set the article to Show Intro Text: Hide.

Template Settings

Color

For each color, the params below will give default values
Blue Red Oranges Green Purple Pink

Body

Background Color
Text Color

Header

Background Color

Footer

Google Font
Body Font-size
Body Font-family
Direction