add wood wallpaper to the kick plates of the stairs. Those rolls are expensive but you would only need one. Not practical with white treads though, it will be stuffed up from black shoe soles in no time.
This is super cute but the article with it is even better. We've been looking for something like this for the kids' chores and I'll be doing this one for sure! Make Cleaning Fun For Kids With A Simple DIY Chore Chart