What type of block could I make that has a 6 1/2 center square and the total block needs to measure 13 1/2?

I am making a t-shirt quilt to be raffled for a ski patroller and 1/2 will be the block I need to make and the other 1/2 of the t-shirts will be a sun with our logo on the bottom.

The quilt will be black and white t-shirts. I haven't decided on the borders yet?

I sure could use some great ideas and I know this is where I will find all the help I need!
:)

here's a beautiful one with tut posted on the QB today http://www.quiltingboard.com/t-161922-1.htm