More to explore:
My cats love shelves!
DIY Cat Bed from Wooden Pallet
Turn a dresser into a book shelf
I've never seen anything like this, so simple and such a good idea. Double Corner Box Shelf
reclaimed wood shelf
This is really cool, looks like organization boxes but it's cat furniture with a modern look, cool.
A cat's fantasy play land was built into the bookshelves offering the feline a scratching post and multilevel shelves and platforms to run and climb on.