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.
DIY outdoor chair using pallets wood. This looks a bit more than I could tackle as a DIYer, but I am pinning just in case I decide to attempt a project like this one. (Sure would be fun to have a swing like this in the backyard!): I'm doing this someday