Today I am like a firework: pretty, pretty hot, and exploding because I can't contain my joyfulness at this wonderful day God has made.
Still working on that continuum of different kinds of metaphors. It's like pulling teeth to find time to work on it and I'm no dentist. But I'll figure it out.
Compare an emotion with an element of nature, or vice versa. Classic metaphor formula.
Her cold pride needed some room to thaw out. It was like a tomato: best ripened in the dark.
The waterfall angrily swept over the cliff.
Question on that last one: Do you consider it to be a metaphor or merely a description? Feel free to vote in the comments!