The Multi Squares on Matte ornament is a good example of mid-period Thomas Glenn Holidays design.  The squares of different sizes and bright colors pop from a background of matte white.  With only one remaining, this now-retired item will be removed from the website once sold out.
The Multi Squares on Matte Ball Ornament
Handcrafted in Poland
Made from glass
Approximately 4 inches tall (10 cm) 
Made by Thomas Glenn Holidays