I did one with 9-3/4 inch squares (why that size you ask? - because we had a 10 inch square exchange - and some of the ladies cut skimpy!!! - and I didn't realize that there was a 9-1/2 inch square ruler available at the time) -
5 squares wide x 7 squares long with a five or six inch border.
It finished at approximately 56 x 74 inches I used warm and Natural batting, brushed arnel for the border and back,
and cotton t-shirt knit fabric for the binding.
Sorry - can't find a picture of it - but it is THE favorite couch cover at my daughter's home!