To begin, let us define "alliteration". Alliteration is when the same sound or letter occurs at the beginning of words in a line of text. Alliteration is a literary device that is often seen in poetry and sometimes in prose. For example, tongue twisters commonly use alliteration. "Peter Piper Picked a Peck of Pickled Peppers." Note the "P" sound in all of the words. Another example would be in Martin Luther King, Jr.'s famous "I Have a Dream" speech, he states, "I have a dream that my four little children will one day live in a nation where they will not be judged by the color of their skin but by the content of their character." (Note the "Cuh" sound in COLor, CONtent, and CHAracter).
So an alliteration for Christmas would be any list of multiple words or a sentence within which words begin with the same consonant sound. We could use the sound seen in "Christmas" (The "cuh" sound). An example would be "Christmas is a time to cozy up on comfortable couches and watch the snowflakes."
Or we could alliterate using any word we want. "Silky snowflakes swiftly fall and swim along the ground on Christmas morning." All of the "s" sounds make this an alliteration.
I found a poem that is filled with alliteration. It's called Crooning Carolers the link is under references. The best part of the poem, for me, would have to be
Curious children try to catch a glimpse as
Santa's sleigh sails silently and swiftly
The imagery in this stanza embodies an image that is highly associate with Christmas and syntax flows very well.
Christmas comes creating comfort, care, and community