You can now find a large organ grill covering fabric that is more
versatile: Far more aesthetic than GoM or others; better projection
surface, possible to hang in panels and capable of special visual
effects...and this fabric is affordable.

Acoustically translucent, visually textural and translucent (and
diffusive), hangs square, can be cut to geometric shapes, 14 colors.
Great for church and theater design. Check out: http://www.studio-
productions-inc.com/accoustical_home.html