Just a couple of ideas
Road Rage -Years after Earth has been taken over by a hostile alien race,the resistance movement now stages hit and run style attacks using modifed cars,trucks and bikes each with armed with machine guns,rockets,mines,shields,armor plating and custom weapons,we would control the drivers each character has a special weapon mounted onto their veircle
Paranormal - "the world you live in is just a sugar coated topping,there is another world beneath it,the real world" all around us there are monsters in the dark spaces and we are their prey,focusing on a hidden group of humans investigating anything from ghosts,Vampires,werewolves and anything beyond