Hi Darth. I have some that look similar to that. Parents were double tail(father)x round tail?(mother). If they are what I think you are looking for, it would give you a great jump start. If you are serious, I will post pictures soon.
Were butterflies one of the classic colors? Or are they some of the new strains? I'm trying to learn a lot from breeders like you because I'm planning on breeding next year and I want to produce better fish, not just fish that are going to sit on somebody's desk in a jar