Thomas Glenn Holidays has a Christmas Plaid ornament (#1751) that is part of the active High Design Collection.  This version, #1753, was a prototype that did not go into production.  Notice the differences: the ornament that is in the active collection has a dark green background and 3 red stripes running horizontally and vertically.  This prototype has reverse coloration: a satiny red background with much wider green stripes.  Side, top, and bottom views are shown here.  If you are a plaid collector, this is a great opportunity to pick up an item that never went into market.  Once all items have sold, the style will be removed from the website.
The Christmas Plaid (Prototype) Ball Ornament
Handcrafted in Poland
Made from glass
Approximately 4 inches tall (10cm)
Made by Thomas Glenn Holidays