As you can see, I've made 3 ten minute blocks. I cut nine 4 1/2 inch squares of one color and six 4 1/2 inch squares of another. If all 3 squares are the same color you cut 12 squares for the blocks and 3 for the centers. The blocks sew up to be a cat whisker shy of 8 inches square.
I cut three 1 1/2 strips of coordinating fabric for the sashing around the blocks. (You can get away with 2 if you steal 2 eight inch pieces off each strip). I sew 2 eight inch strips to the first block (One piece on each end). Sew on the second block, sew 2 eight inch strips on the third which I then sew to the second. Then I sew on the side strips. If you're a legalist, measure the length of your three framed blocks, if you're me I just sew on the outside strips and trim off the extra.
Next step is the outside border. I cut two 2 inch strips and sewed it on the sides. I squared up my block and then proceeded to add the pointy ends. Now I'm not sure I did this the legal way but it worked fine for me.
I then cut two 2 inch strips for the binding and added it. If you prefer a narrow or wider binding adjust your fabric width accordingly.
I have seen this table runner done in valentines fabric and instead of sewing down the center square, they left it puffy and sewed a heart in the center.