Here's a photo (Mibcapper's, I believe) which includes a green angel.
They have a tan custardy base. I think they are essentially a six-ribbon marble, but sometimes it's hard to tell because of how the ribbons smear and split each other. I'm pretty sure it's not a vaseline base, at least I'm pretty sure the one red one I sold didn't have one.
I think the blue angel was named first, by Smitty, after the Blue Angels flight squadron.