I have been breeding guppies for 4 years now, and my goal was to produce ones that resemble betta males because you obviously can't house those together.
Here is my "Chocolate Cherry" line:
Young adult male size comparison to standard size HM Betta (Adult males are larger, but didn't want to stress another out exposing it to Mr. Betta. This one young, cooperative, and full of beans):
Over all, pretty happy with the results. Extra large, finny, colorful, and breed true:
Recently, I have been experimenting with extended high dorsals, and introduced them to the CC line and have been getting these, which I hope to refine. Young adult male:
I am calling them "Rorschach". They are unique in that the pattern changes slightly, but the color does not. I haven't made my mind up about the heart shaped tail yet, but I like the unusual...
Just thought I'd share