If you want to play with shaders interactively, take a look at Tao Presentations. Will let you combine shaders and real-time 2D/3D animations. http://www.taodyne.com/shop/en/blog/67-real-time-stereoscopi... for an example, http://www.taodyne.com/shop/en/blog/60-screencast-building-a... for another one.