Basically, most shoujo can and do have a BL version. The only plot that seems to be exclusive to BL is the 'I'm a guy so we can't be together' plot. 'Rape is love' plot also seems to be more forgivable in BL.
(BL = boys love, aka male/male relationship)
For example Kimi ni Todoke reminds me of Bukiyou na Silent although granted it's not really similar.
Just at the top of my head, Absolute Boyfriend reminds me of Kiss me, Master by Asou Mizuho.
Oh, I was just wondering because shojo romances tend to have decent plotting...if you want to think that, but I don't like the females in them. That and I was just curious if like...a yaoi author did something similar.
Maybe should've asked about decent BL titles...oh well. I limit myself too much, only reading what I can buy in the US.
There's already a good amount of BL undertone in Uragiri wa Boku no Namae o Shitte Iru with the whole girl-to-boy reincarnation backstory but I would definitely still read/watch it the girl/guy was a guy to begin with.