I got myself this App for my iPhone . It is called Lens FX and it cost me short of 4 Euros. You can add different effects to your photos like explosions, muzzle flashes, laser beams, smoke, fog and a lot more. The effects are added by overlaying additional layers on your photo you can then adapt the overlays by changing direction, adapting color or opacity etc. The App is very powerful  recommended if you have an iPhone.

Here are a few examples I did:

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As you can see I added muzzle flashes, an explosion in the back and a flying bullet or tracer round to the right.

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I added a plasma beam and an explosion.

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Added muzzle flashes, explosions and fog.

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Added Laserbeams, rockets (sorry no photon torpedoes), Sun and moon.

What do you think? These are the first pictures I did with the App there will definitely be a learning curve so will try some more in the future.