To wash away sins how about giving or making soap?
Givers log blog has a tutorial on making pretty soap lables as teacher’s gifts. Easy to convert to wedding/bar/bat mitzvah favors or to make with families using children’s artwork. As an activity I would suggest printing on clear lables rather than transparencies.
Soapylovesdebbie photo stream on flickr from lets get soapy also has links to tutorials on how to make a soap making party. Note her copyright on the image:
http://www.flickr.com/photos/soapylove/ / CC BY 2.0