Simple:
* Luminous lamp
* Lazy lizard
* Long lane
More Complex:
* Luminous lamps lit the long, lonesome lane.
* Little lily lovers looked longingly at the lush lake.
* Low and long, the lonesome lullaby lulled the little lamb.
Humorous:
* Lots of laughter leaded to a lousy lunch.
* Lawyers love long lawsuits.
Remember, alliteration is the repetition of the same consonant sound at the beginning of words. Have fun creating your own!