Anyhoo...
For those of you [cretins] who haven't seen "Westside Story," Shame on you! Its awesome. And a musical. Wow, never heard those two words together, eh? Its basically "Romeo and Juliet" in more modern times.
Continuing on...
So Ginny falls for Draco and vice versa. Of course Draco, being the "enemy," she's not allowed to see him. She, of course, disobeys. Their love grows, and so does the tension and hate. The only rule: Make it cool. Do the movie justice. You guys basically have free-run with this; make it extremely fluffy, snoggy, or tear-jerking. Have fun!
~Jade
*Fun-fact: I had originally thought of this for Harry and Hermione, as its such a wonderful plotline, but that obviously wouldn't work, lol.*