Pinterest would have you believe you need to decorate everything from ceiling to floor, but it's superficial. I say give it some time and fill the space with student work. The classroom should reflect the students' work, not the teacher's. And it will save you some $$$. I'm not saying don't use your anchor charts (do!), but if you feel like you need to fill space just to fill it, don't bother. Classrooms are over-stimulating already.