Fr. Z has a fantastic report on a diocesan chant workshop in Madison, Wisconsin, that he attended. It includes some interesting commentary on altars and painting. Most impressive is this good picture of Fr. Robert Skeris working on the chant with the attendees.
Much more, including a good combox session, at this link:
http://wdtprs.com/blog/2010/10/madison-wi-gregorian-chant-workshop/