If you really want to be creative, how about adding something to the narrative that does not already exist, but that employs the motifs that you mention? For example, we know that Daisy knew Gatsby "back in the day" when he was a soldier, and for some reason, they did not get together then -- probably because of class, wealth, the war. So, you could write something different about how and why Gatsby was parted from Daisy. Perhaps Daisy and Gatsby meet at a racing event (sports), or perhaps they meet at a golf match where Daisy is playing against Jordan Baker. Daisy loses the match because Jordan has cheated by not writing down all her strokes. Gatsby is Jordan's caddy, so he realizes this and tells Daisy about it after the match, but it is too late. Daisy cannot do anything about the golf match, but she falls for the handsome caddy, who is working at the posh golf course where Daisy is a member. Perhaps Gatsby and Daisy plan to elope. Gatsby is driving to her house to pick her up. He waits forever at a cross street for the light to turn green. The light finally turns green, and he arrives at her house only to find that her father is waiting for him with a shotgun. Gatsby flees and is so upset that he joins the army where he is immediately sent off to the war. He writes to Daisy while in Europe, but her father intercepts the letters and never gives them to her, except for his last letter where he tells her he has been severely wounded and is not expected to live. So, Daisy, despondant, goes on to marry Tom Buchanan, thinking that Gatsby is dead.