Quiltforme

I have almost finished my double wedding ring quilt for my grandmother it is a lap quilt anything bigger she would use as art. My question is I want to make it longer not wider. I thought maybe using the border fabric in a piano key border with a solid chocolate brown. Here is the catch I want to make the top and bottom border total 8" so it would be 4" top and bottom and 2" sides. What do you think?? I have been busy the last 2 days.