Romance has always been a pretty big component of comic book lore, Spiderman and Mary Jane, Superman and Lois Lane, and the like. For me, even though I am not a big romance fan, I find superhero romances to be very heartwarming or heartwrenching depending on the situation. Some characters seem perfect for each other, at least in my opinion, and others not so much. Excuse me for not being up to date on the latest scenarios and storylines, but here are some romances that I would like to come into fruitition, possible or impossible, I can dream.  
Cpt.Marvel and Batgirl- I know this is an insane idea, and you probably think it could never work, but I did say I'd talk about impossibilities and some dreams. First of all to explain myself, I had this idea pop into my head out of nowhere...one day it just came to me that Billy Batson and Cassandra Cain (talking about fromer Cpt. Marvel and Batgirl) might be perfect for eachother. Now when this came to me, a little story formed in my head that this relationship would be a 'you have your secrets, I have mine' kind of deal, and that they were superheroes in love, secret identities being revealed would create too much friction. So Batgirl would be completely unaware that her boyfriend was actually a little kid. If I got to read about a romance like that, I'd be hoping she'd never realize for the sake of her and him. 
Hawkman and Hawkgirl- These two are destined for eachother and I hate seeing it otherwise. When Hawkgirl and Red Arrow were hooking up, I was a little torn by Kendra's feeligs for Roy and the tradition of the hawk romance. Now that that relationship has dissolved maybe the two resurrected lovers can be reunited. If Powergirl doesn't get in the way (I'm getting this from The Lightning Saga, not behind JSA) if she hasn't already. Just that one glimpse I saw while reading the lightning saga, made me realize that I should've been keeping up with JSA. I am or was, depending on their current status, not a big fan of this idea. I'll stick with tradition, and hope in time that their relationship works out. 
Atom Smasher and Stargirl- I do not follow JSA, but from what I understand Atom Smasher, is off somewhere on hiatus and Stargirl is all on her lonesome. Yes, there is an age difference, that the old-timers may have objected to, but I just can help but want these two together. There relationship to me, has alot of similarities with the X-men romance of Colossus and Shadowcat, same thing about age difference and the corresponding characters similar traits. Shadowcat and Stargirl, spirited teenage girls and Colossus and Atom Smasher, power-house young men. Just like I adore the bond between Kitty and Colossus, do I adore the possibility of Stars and Smasher, just Big A needs to come back first... 
Beastboy and Jayna- Okay this is the wild one (thats a pun). Some people really love BB and Raven together, I on the other hand do not. If I were Beastboy, I'd get off that bad juju train and get with someone who is not the daughter of some demon lord. This may be really strange, but so much great artwork and hilarious jokes could come into play even if it was just a fling. Now, I guess I am just putting the two people who turn into animals together, but I have to admit, I think it would be adorable. Just imagine Zan making jokes, afterall he has to be there for Jayna to transform (they are the Wonder Twins) so no 'role-playing' could occur without him. Yeah okay thats sort of gross, but it could happen. 
Well thats all I can think of for now, If I think or dream of others, I'll let you know.