I hope it is all right to post this here; ALRY Publications has just published a book of my arrangements of Advent music, called “The Advent Harpist”. If you are looking for music appropriate to the season, I hope you will take a look at it. http://www.alrypublications.com/molnar-suhajda-the-advent-harpist/
It is appropriate for pedal or lever harp (I actually wrote them at the lever harp!) and are arranged in a simple style for Advent. Of course, you could just use them as a jumping off point if you like.
I always see people asking for music for Advent, so I thought it might be a nice collection to have. I hope it’s helpful!