Hirondelle: For Tom and Hermione, I've always liked it when Hermione is somehow sent back in time by her Time Turner, being found out by Tom but falling for him in the mean time while hating him. Gotta love those love/hate relationships. Not sure on the main plot of it yet, but maybe we can kinda shift their ages around, make them maybe teachers or something. Like Tom Riddle got the position as DADA teacher and Hermione, just graduated Hogwarts is somehow sent back in time to Tom's era where she can only find the job position as a professor at Hogwarts, while knowing about Tom and desperately trying to get home, but the two somehow fall in love?

As for the friendzoned one, I like the idea of a girl suddenly going through something major, like her first heartbreak, a death of a loved one, either or and in comes this guy she's always known but never talked with. They become the good friends and the guy falls madly in love with her, but the girl has her eyes on someone else and assumes she doesn't feel the same way. But when the guy she likes ends up somehow with another girl, the girl caves in and pulls the guy out o the friendzone after going to Prom together. Turns out she's head over heels for him and voila.