Book Shelves Under the Stairs. Lovely use of often-neglected space.
How to Build Under the Stairs Shelves for Storage DIY Project
RWJSear Restorative Carpentry sash window repairs: Under stairs storage cupboard
Basement idea: Under Stair Storage Design, Pictures, Remodel, Decor and Ideas - page 10 I like to look of this. However we would have to do some work on the kitchen closet- which is in the works as well I think.