I want to present an elementary lecture about Fractals in the Nature. So, I am searching open or online references with good pictures like the following one:

![enter image description here](https://i.stack.imgur.com/6LPFf.jpg) ![enter image description here](https://i.stack.imgur.com/ULhod.jpg)

I prepared a good program that makes the fractals and the participants don't know much the analysis patterns behind this concept, so I am going to introduce Fractals in the Nature just by doing some graphical figures or setting formulas and etc. I will be so pleased if I know your suggestions.Thanks for the time you will give me.