Hello, OpenGL. Draw two rectangles.
Draw input data using OpenGL polygon primitives.
Terrain viewer that loads data from a file and renders the scene using a couple of OpenGL primitives.
Bezier curve builder that allow for both perspective and orthographic projection and uses OpenGL selection and gluUnProject to support picking with the mouse.
Experiments with OpenGL texture wrapping modes, texture modulation, and minification/magnification filters.
Some simple shading experience with OpenGL and GLSL.