"Joy to the World" is a popular Christmas carol with lyrics by Isaac Watts and music by G.F.Handel. As of the late 20th century, Joy to the World was the most published Christmas hymn in North America.
For Flute and guitar duet.
Easy.
With downloadable mp3's for audio help (one with both the Flute and guitar and one with guitar only for practicing the flute).
With guitar tablature. With melody line. With lyrics.
Pages: three pages (score and Flute part)

It's Beginning to Look Like Christmas is a Christmas song written in 1951 by Meredith Willson.
Here is an arrangement for Guitar solo  (classical guitar or acoustic guitar fingestyle) with some jazz elements.
Intermediate.
With Tablature. With finger position suggestions. With guitar chords.
Pages: two pages.

Let It Snow! Let It Snow! Let It Snow!  is a song written by lyricist Sammy Cahn and composer Jule Styne in July 1945. The song has been recorded by many artists as  Frank Sinatra (1950), Rod Stewart, Carly Simon.
For Guitar fingerstyle solo or Guitar and Voice.
Guitar in drop D tuning (low E to D).
With Lyrics. With melody line. With standard notation and tablature (TAB).
Early Intermediate.
Pages: Three (3) pages.

Blue Christmas is a Christmas song written by Billy Hayes and Jay W. Johnson and most famously performed by Elvis Presley. It is a tale of unrequited love during the holidays and is a longstanding staple of Christmas music, especially in the country genre.

Here is an arrangement for Guitar solo or Guitar and voice (classical guitar or acoustic guitar fingestyle).
Easy.
With Tablature.
Pages: two pages.

I Say a Little Prayer is a song written by Burt Bacharach and Hal David for Dionne Warwick, originally peaking at number four on the U.S. Billboard Hot 100 pop singles chart in December 1967.
For Guitar fingerstyle (Acoustic guitar or Classical guitar). Early-intermediate.
With guitar tablature. With lyrics.
Pages: 5 pages, 2:10' min