Fly away !
I have a soft spot for industrial images, and for airships as well. I used the factory image - the chimney, smoke, and various bits and pieces of that image everywhere. Also, used the pilot and some pieces of the airplane from the fighter jet image. Clouds, some machinery, cables, airship, and bits of texture are from my own photos. Also, there's quite a bit of of simply drawn rectangles ;)
The factory image was also my main inspiration - it gave me the idea to work with silhouettes. I had lots of fun putting it all together.