Ray of Sunshine

With all this cheery weather in summertime...time for something nice!

Meaning
A ray of sunshine is a good thing (of course). It can mean either one of two things:

1. A piece of positive news.

2. Someone who is a joy to be with.

Use in Normal Speech
When getting good news.

"OK, so things didn't go according to plan in our operation, but hey, there is one ray of sunshine - we're learning all the time about how to make it work."

When describing someone.

"Leah's a real ray of sunshine, always positive and cheery."