If you scroll down on this website theres a pretty good description of Blue Rays:
http://lightworkers.org/blog/32627/are-you-from-blue-ray
Personally as a blue ray, I feel we are more prone to be in the services to help others, so nurses, Drs, Policeman, in the military, carers etc. We have a lot of mediums, psychics or intuitives that work in these fields using their intuition to help others.
You have a lot of blue in your aura, but this wont necessarily show up in an auragraph (photo of the aura) I know mine has never shown up in those. You will be drawn to certain symbols, mine is the Septagram (7 pointed star with two points at the bottom) which for me signifies the gateway or devinity as well as various other things 7 stands for. I personally work close with Saint Germain but others work with other Ascended Masters.
I also believe the Blue Rays are Pathfinders of Peace, which means we help and not hinder, but not everyone will connect with that.
You can be a Blue Ray out of the main time period because that is when the main lot where born, so you do get dribs and drabs of others crossing into other birth times, its just not the majority.
Oh by the way Pathfinders, will pretty much cross of everything within other sections (ie Earth Angels, walk ins, healers, etc) because we have had to train in all areas and not specialise in any of them, that is where all the confusion comes in.
Blues are the natural leaders but don't like the lime light, they prefer to step back and watch. In my experience they come in a few sections (I think I've remembered them right but I don't have my channelled notes with me):
1. Ambassadors/Emissaries 2. Communications 3. Defence/security and protection 4. Justice 5. Medicine (including veterinary) 6. Engineering/invention 7. Spiritual
If I find my notes I will let you know what they are.