Background Image Suggestion and Material for Robot 'Stingers'

Hey everyone,

I started working on an image of some bee-like (or something like that) robots. I attached some images I made. For now I’m looking for a background image for the gray one and I can’t seem to find anything that works. Any suggestions? I’m looking for a spy-like theme here :cool:

For the second image I was aiming for a sci-fi theme. My only issue with this one is that the robots look like they are plastic toys to me. Any way to fix this or is it just me?

Any other suggestions are welcome, thanks!