Maybe not the picture you are thinking of, but is this what you mean? They are called Framed Hexagons:
http://www.quiltingboard.com/t-580-1.htm
Also found these:
http://www.quiltingboard.com/t-107698-1.htm
http://www.quiltingboard.com/t-73904-1.htm
Edit: Oops! Maybe you don't mean framed hexagons. Also found this method of quilt-as-you-go hexagons:
http://ajpadilla.com/tutorials/rever.../sewing-blocks