Simple:
* Silent snow softly settles.
* Slippery snake slithers slowly.
* Sun shines strongly.
More Complex:
* Sun-kissed sea shells sparkled silver.
* Stealthy shadows slipped silently sideways.
* Sweet songs soared sweetly skyward.
* Starry skies sparkled silver and sapphire.
Humorous:
* She sold sea shells by the sea shore.
* Seven six six seven six six seven.
* So silly, so stupid!
Literary:
* "The soft sun sleeps, star-kissed, on the sea." (This is a line I made up, but it has the alliteration!)
Remember: Alliteration is the repetition of consonant sounds at the beginning of words. It can be used for emphasis, rhythm, and to create a memorable effect in writing and speech.