Guardians of the Galaxy did really well, so that means there will be a sequel (Guardians of the Galaxy 2: 2 Guardians, 2 Galaxy), and I think that is a great opportunity to correct what I perceive to be a glaring flaw in the first movie: Gamora’s criminal under-utilization as the most badass character of all.
Now, everyone loves a good, clean karate-fight. Your Captain America versus Batroc the Leaper, &c. But also one of the things that makes fights great and interesting is when there are obstacles or limitations that the fighter has to overcome (think basically every Jackie Chan fight scene ever). These are good ways to make the fight unique and creative, and also often to raise the stakes of a fight scene part way through, so that we don’t get tired of seeing people try to kick each other or what have you.
Guardians of the Galaxy did do one of these, the Gamora / Star-Lord Supine Karate Fight, and don’t get me wrong, I love a good fight where both characters are lying down. In my opinion, almost ANY fight could be improved by having the fighters lie on the ground and try to hit each other!
Still, you’ve done that once. Here are some other ideas.