So achievable, in fact, that I made two!.
The rainbow one is for Mia and the pink, stitched in a single DMC variegated thread, is for Jess.
I also made Jess an extra hoops as her wall was looking a bit bare compared to Mia's! I get a lovely bundle of Kona cottons each month from Sew Hot and the pink bundle was just begging to made into something ombre! Simple piecing and some chunky hand quilting - this is a 14" hoop (I think) so her wall is definitely less bare now!