I am going to go ahead and admit that this "after" isn't really my personal style BUT as someone who dislikes all the primary colored kids stuff that is out there...I thought this IDEA was genius! Check it out...
via design sponge
You could do this SOOOO easily! Just tape off a design that IS your style. I would do something like this...
Or this...
Or even keep the color blocks but match it to your (or your kid's) color scheme...