Bereza CubeA follow-up to the Birch beam cube (which does not have the shape of a cube) in shape of a true cube.
BGA CubeFeaturing the Black, Gould & Associates insurance company.
Binder CubeAnother German promo cube, this one for a company called "Binder Kunststofftechnik GMBH".
Boeing CubeObviously produced by/for the Boeing Company. Each face has a different airplane version [737, 747, 757, etc.]
Boob Cube IFeatures pictures of six different nude women. The pictures on this cube (and others similar) have become very saturated over time.
Britney Spears CubeA custom built 3x3x3 Rubik's Cube featuring six different photographs of Britney Spears.