I don't generally like ship names at all. I like McShep because it sounds neat, and Porne because it's the most awesome ship name ever. Otherwise, I just use the abbreviations (like B/J, which I reckon is also a nice, porny ship name).

Sparky is, to me, totally off the mark anyway because I've never seen any sparks there. Sure, every once in a while Elizabeth showed a bit of a crush on John, but I never saw anything going the other way. They always seemed to be too familial for romance. But then I think the same thing about John and Teyla when others don't, so *shrugs*