bloodred is it's own mutation, and it acts mostly as a simple recessive gene, but not entirely.
Don S. at south mountain reptiles has amel and anery stripes for sale, I have seen ghost stripes offered in the classifieds. Rich Z. at serpenco is working on butter stripes, he had some for sale for a whopping $1000 each.
I saw a pic of a corn before that was very dark and was mostly black or very dark with red blotches. I believe it was a kitsatchi (sp?) corn, and would be a natural variation and not a seperate morph. I don't know of anyone working with a line of snakes that look like that.