Along the way I thought that I'd post some references pieces in the embroidery genre that I am working on. Unfortunately most of the pictures that I can find are black and white, though the color pictures that I find show brightly colored embroidery with a pretty good variety of colors. In cases where I can get color pictures, I have stitched the patterns in matching colors.
Master Wymarc's web page got me started on this and I found the book "Niedersächsiche Bildstickereien des Mittelalters" by Renate Kroos. It was dumb luck that the book was available through the Georgia library system, since there aren't that many copies. The book has tons of black and white plates of brickwork examples from Germany and information on them. It is in German though, so its been slow going for me. Many of the patterns charted are coming from plates in this book.
The New York Met has a large piece in the Cloisters:
Altar Frontal, late 14th century
German; Silk on linen; 63 x 62 1/2 in. (160 x 158.8 cm)
Lady Sabine Berard has taken lovely detail pictures of the piece which can be found here: