With computers, the use of boxes, lines, and fancy type has increased. In some ways, these are like artwork, and need to be kept few and simple. There's nothing wrong with occasional white space to give the eye a break. Use clip art to help make bookmarks, placemats, tickets, posters and more. But don't get too creative.
Computers permit great freedom in manipulating and redesigning clip art.
Be careful to maintain proportionality, especially when displaying the Disciples chalice. So step out boldly, led by your creativity. Use graphics to make your message come alive, catch your reader's eye and set the tone for what follows.