Disappearing Nine Patch (D9P) ...
You take nine squares, sew them into 3 rows by 3 rows (a 9-patch). Cut in half vertically, then cut in half horizontally.
Here are some good tutorials from the board:
http://www.quiltingboard.com/t-40144-1.htm
http://www.quiltingboard.com/t-78255-1.htm
and for a real flair ...
http://www.quiltingboard.com/t-95621-1.htm
Use the 'search' feature at the top menu, enter 'D9P', enjoy all the posts!