This is a perfect combo of my two favorite ideas for that space under the stairs leading to the basement. A reading nook AND book storage and shelves . assuming that there is enough space for this there.
Make this hot air balloon chalkboard. Cut a piece of foamcore in the shape of a hot air balloon and cover it with a piece of Wallies chalkboard sheet. Attach a pencil cup with cup hooks or cable ties and fill it with chalk.