Here's some cool Computer Graphics projects I've worked on this semester:
In this assignment I wrote a variant of the Midpoint Algorithm to draw lines. You can also toggle attributes such as color, anti-aliasing, and line weight.
Here's a cool Wireframe renderer. I wrote Matricies that handle all the transforms from Object Space to Screen Space, and everything in between. I threw in my animated robot dude for good fun, and a slider that moves between a pure perspective and orthographic projection. With a perspective projection, objects farther away seem smaller and converge at a vanishing point. On the other hand, orthographic projection has no vanishing point at all.
I wrote the programs using a Java-based work environment called Processing. It's very easy to get started making cool stuff. Check it out.