I do not use fabric strips to cover the back joins. Mine are just seamed like the front. I use Kaye Wood's six hour quilt method, but do not use a serger. Her video displays long strips, but you can make those strips out of various blocks. This is a quilt I just finished within the last week, using the method.
Her video is here
https://www.youtube.com/watch?v=sOTV-YSF-48
It is a queen size, 90 x 108 inches, reversible sides. Both sides are displayed.