I don't think the BEL is a fluke, but could see how it was possibly discovered with a fluke...
There's a couple of pairings that will potentially produce blue-eyed Lucy's, such as Lesser x Lesser, and Mojave x Mojave. There is a few more too, I believe.
The black eyed lucy is Fire x Fire. And I don't thinks it's limited to just Fire x Fire either, but I'm not sure what other pairings will make a black eyed lucy.
My BEL is a super lesser but stacked with possibles too so looking forward to seeing what eggs she produces in a few seasons time.