Art and the Church - Materials for Use in Churches
Materials based on the Christian calendar are divided in three categories, see below. Added to this are an Old Testament and a New Testament section. The meditations for Advent, Christmas, Epiphany, Lent, Easter, Ascension and Pentecost stand in the Christian calendar sections and not again in the Old and New Testament sections.
Here you find a number of introductory articles about the Christian calendar:Beth Bevis: Living the Church Year
Calvin ICW - The Pattern of the Christian Calendar
G. Pennoyer & G. Wolfe: Advent and Christmas
John Witvliet - Introduction to the Christian Year
Laurel Gasque: The Christian Calendar