Lightning - No matter how violent the storm, there is always beauty to be seen, if we can weather it out.
Calm Sunsets:
Thunderstorms
Softly Painted Sky
Rainbows - For me, it's a special symbol reassuring everything will work out in the end. What I may see, is only a small part of something greater. If a rainbow comes before a storm it means I am protected, during a storm - I am safe no matter what may be. After a storm, that I have made it and survived, and that good will come out of the storm, no matter what may have happened.