Phil - The book I was talking about is "What color is your aura?" by Barbara Bowers. There have been many books since that original book using her system If you really want to dive into the cult that has been created about Indigo's specifically then look up books like "The Indigo Children". Basically I saw you as Indigo because of your reserved nature, deep spiritual sense, non-conformity, willing to take a non-prestigious career, direct honesty, etc.. there is alot of stuff about the Indigo that just seemed you. I've only met two in my life besides myself, so somewhat because you seemed like the other one I met, I threw you in that catagory. Here's a brief test I just found for anyone to take. I'm pretty sure this lady's system is based on Barbara Bowers.

This lady calls some of the auras by different names like nurturing tan is sensitive tan, mental tan is logical tan, etc...
Some other auras that I would guess or already know from taking the real book test are: (some of these are pretty far reaches)

JimS. - Green
JimA. - Blue
Phil - Indigo
John - Lavender
Ned - Crystal
Heidi - Yellow
Dave - Green
ChrisH. - Mental Tan
Sonya - Magenta
Sean - Crystal
Shari - Green
Clint - Nurturing Tan
Becky - Red
Hank - Crystal
Liz - Magenta?
Amos - Mental Tan?

I was going to try to guess everyone, but some people are just too difficult to catagorize. (Not that anyone wants to be catagorized, but this is all in fun.)