This is an ultra-easy tutorial, but does give an idea of how to make an image look more interesting, or if you want to make some sort of vehicle appear as it's exiting a dark tunnel.
Step 1. Open your image. As said, it must have a dark tunnel.
Step 2. Go to Filter>Render>Lens Flare. Set the settings to 105mm prime, and set to 70% (more or less if you feel this amount doesn't suit for your image).
Really simple and still a very cool effect!