Fractals are special geometrical shapes created through iteration.
You take a simple starting rule and apply it over and over again.
One of the most famous fractals is the Mandelbrot set.
This project is a multi-threaded app to draw a simple Mandelbrot fractal.
Learning to implement a Mandelbrot fractal painter is a good C# beginner project.
If you would like to know more, have a look at
Besides drawing a fractal, it also teaches you desktop app development with Windows Forms and C-Sharp.
Windows Forms is a quick way to get up and running with C# desktop app development.
Just make sure you know object oriented programming in C-Sharp and have Microsoft Visual Studio 2026 installed.