I wanted a plain cream backing for my most recent quilt, but didn’t have quite enough fabric. So I took out a bunch of orphan blocks, made them all the same size by either adding small borders to float the smaller ones, or trimming the larger ones. I then stitched them into 2 rows with sashings between the blocks and between the rows.
Since it’s surrounded by so much white, it adds a nice pop of colour without hurting your brain.