Fix my Blender 3d Objects

Hi. The attache Blender file contains a theatre, grass, a parking lot and a metal detector on layer 1, and two drones on layer 2. They were created for Cycles Render, but I need them to look good in Blender Render. You can see the difference when you render them in both processes. I need each of the items to be transformed, re-created, with new materials or textures, whatever it takes so they will look great when I render the animation in Bender Render. Unfortunately my characters are designed for Blender Render and so I have to stick with it. Is this something you can do, and if so, how much?