The Web site hasslefreeclipart.com contains two sets of graphics that you might find useful to illustrate handouts or parish bulletins:
Biblical Images: with illustrations of biblical figures from the Old and the New Testament.The image of Moses on the left is from this collection of over 40 clipart graphics.
Christian: A smaller collection of images of Christian symbols.
For more clipart, consult the collection on the Resources for Catholic Educators Web site:
Old Testament Clipart - New Testament Clipart - Gospel Clipart - Lent Clipart - Palm Sunday Clipart - Feasts & Special Days - Holy Thursday Clipart - Good Friday Clipart - Objects in a Church - Church Buildings - Sacraments Clipart - Angels Clipart - RCIA - Christian Clipart: Various - Church and School Bulletins - Advent & Christmas Clipart - Clipart Links