I got my hands on this 3D concert lighting visualization software called Capture Polar a while ago. These are a few of my designs. You can build trusses, stages, and most importantly, make lots of pretty colours. If you have a lighting console you can connect it too! ETC uses it for their console tutorial videos.
The student version is FREE!!!! You can download it here:
For all you returning to school, This is extremely pertinent. Do what makes you happy and prepare to live that life, no matter the consequences. Choose your life.