bookshelfporn: DIY Ladder Bookshelves To get this look, all you need are two ladders and some wood planks. Paint the ladders and the wood if you want, then slide the wood planks through the ladders so they are resting on the ladder steps.
Pieces of plywood were added to this ladder, then it was painted Golden Avocado. The potted plants pop against the bright color, making for a major statement. Check out the step-by-step DIY on how to create this look. Source: A Beautiful Mess
Faux Built-In Bookshelves - flank a doorway with identical bookcases that reach almost to the ceiling and install moldings around the tops of the shelves. As a style bonus, paint the bookcase before installation, or line the backs with pretty paper.