Shelving and colour
Shelving with built in storage to the side
Open under stairs but with storage bench like furniture AND the shelving style /boxes up the wall
Wall divide - bright seating area with plants
Panelled/slat wall - bold colour
Bookcase dark colour, wood ladder and seating area
For top landing? Wood on ceiling?
Ply radiator cover
Black book shelves over the door too?
Narrow planter at end of wall?