Similar to the first example shown in this article this bookshelf headboard from Made By Mood shows how you don’t necessarily need to put yours up against a wall and instead makes a great solution for a partition.
Are you afraid that your guest bedroom with twin beds might look a little young? There are ways around it — and you can have fun with color! Check out this sunny yellow room with white bedding from Carla Aston or go for blue with black bedding like this second example from HGTV.
This is precisely what an accent wall in chalkboard paint does. The popular modern trend is to use it as a headboard accent wall and if your bedroom is already draped in gentle relaxing neutral hues then a black chalkboard wall is indeed the perfect choice.
If you’ve got a lot of books why not just stretch your bookshelf headboard as far as you can? Here’s one featured on The Design Files that has little book cubbies built around the whole wall of a bed.