The topic came up in the last Knit Night that some people were working on prayer shawls.
The basic patterns and the prayer shawl ministry information are found at http://www.shawlministry.com/.
The library consortium has these titles available for those wanting more pattern ideas:
Knit Prayer Shawls: 15 Wraps to Share by Susan Sullivan
The Prayer Shawl Minstry: Reaching Those in Need (contains both knit and crochet patterns) and
The Prayer Shawl Companion: 38 Knitted Designs to Embrace, Inspire, and Celebrate Life by Janet Bristow.
Almost any pattern can be used in knit, crochet, or knitting loom. The basic size is about 20"-24" and from "fingertip to fingertip" or from "wrist to wrist" (generally between 5 and 6 feet long). Most patterns specify a nice soft yarn.
I've found both rectangular and triangular patterns.
If this doesn't give you enough to go on yet, put "prayer shawl patterns" into your search engine. You'll find more than enough to make in one lifetime.