From only using two fabrics you can have the positive and negative look. (I just love that brown fabric in these two blocks)
In this sample I used 3 different fabrics for the centre block and then used 2 different fabrics for the outside borders (directions for the borders) This sample will be made up as a cushion for the display in the shop.
And then lastly, I went a bit funky with my fabric choice. I had a charm pack that I didn't know what to do with and this pattern is perfect to use a charm pack in as they are 5" squares - you just have to trim them down to your desired size. I then just added two borders and sewed it up into a cushion. See how the different fabrics changes the whole look.