Using ORBX Global program, I took this FSX screen capture of the Graf Zeppelin over Germany. The cloud effects are derived from REX and the Zeppelin itself was found on flightsim.com and it is a free software. For a better atmosphere, if you decide to take a screen capture, fly the Zeppelin either during the morning or at dusk while there is still enough light, and so that the sun will strike the balloon from the side.
Few videos are available on YouTube to show you how to deal with the Zeppelin. It’s not enough to apply full throttle and hope that it will rise because it will not. You first have to take care of the ballasts. But within only few minutes of watching the videos and applying the correct manoeuvers, I promise that you will be airborne and then the rest will come pretty naturally.
The picture was slightly edited with Photoshop to add some constrasts to the screen capture.