Go with her choices... Btw, they sell mesh bumpers nowadays that are supposed to be safer. I just bought the sheets and mesh bumper for pregnant cousin. I am making a diaper bag, quilt, and quilted baby wipe and diaper carrier. (all patterns in same book).
A few years ago, my DSIL wanted a baby quilt with fall leaves, browns, reds, oranges, etc. which was her design for the nursery. On the back, I took the liberty of putting a brown toile fabric picturing baby animals. I think you could add a juvenile print in the mothers chosen colors to the back...