Would be fun kid hideout space! Awesome dog kennel under the stairs design idea. If you want an indoor dog house, utilizing the space under the stairs for a cozy, attractive and practical space for dogs is a good idea! I love this design.
grey & white Interesting that the crown molding is painted gray to blend with the upper portion of the wall. This is a great Tim to avoid "boxing" a room by painting upper and lower trim. Either continue ceiling color onto upper, or wall, as here.