Thanks for sharing, sounds like a wonderful experience!  I love hearing other's experience and  different ways they meditate.  I experience the colors you described, mostly violet and green. At first I just experienced colors but as you mentioned I think there is something more and I believe as I practice and learn to relax more- more will be revealed  
 
I have been in a little slump lately, all of my own making, but did take some time this weekend to breath and meditate. I could feel the stress washing away...aahhh  Now if I only had a pool in my yard  
 
Love,
Cindy