I think all of my ships come from the "ooooh pretty!" kind of thing, actually. There are some of them, though, that I see only as really close friends in canon (like Merry and Pippin), and I would hate to see anything or anyone come between them.
On second thought, I think Dom/Billy started as a wouldn't-it-be-hot sort of thing but then crossed over into the realm of LF, though I guess this particular pairing doesn't really qualify as a legendary friendship. About a year ago, I went through a couple of months when I had a hard time separating what was real from what I wanted to be real, and I was quite angsty about their friendship. I still am a bit, but it's none of my business. Anyway, for a time there I was slashing them because I couldn't bear the thought of them slipping apart because of Billy's girlfriend.
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On second thought, I think Dom/Billy started as a wouldn't-it-be-hot sort of thing but then crossed over into the realm of LF, though I guess this particular pairing doesn't really qualify as a legendary friendship. About a year ago, I went through a couple of months when I had a hard time separating what was real from what I wanted to be real, and I was quite angsty about their friendship. I still am a bit, but it's none of my business. Anyway, for a time there I was slashing them because I couldn't bear the thought of them slipping apart because of Billy's girlfriend.
Sorry if I'm rambling. :)