It's more like the pictures are already here in somebody's build thread. You read threads and decide what type of ceiling you like from there.
So tell us about what you're working on or planning on. Do you have a us yet? Honestly we'd rather help you find a good bus. Either way, yes you'll want insulation. Even if you think you're tough and think you can get by without insulation, you'll change your mind after the first winter.
Have fun with your build.