Simple:
* Slippery slope
* Big bad wolf
* Peter Piper picked
More complex:
* The whispering wind whipped wildly
* She sells seashells by the seashore
* A cunning cat caught a curious crow
Figurative:
* A feather-light feeling
* A heart-heavy sigh
* The sweet sound of silence
Let me know if you'd like more examples or have a specific theme in mind!