I spotted this Ballard Designs photo over on Sherry’s blog and liked the way they had used simple baskets for book storage to give a neutral room more texture:
Such an easy update! And, these water hyacinth baskets (which look very similar) from The Container Store are on sale for a great price right now:
You could further customize them by adding numbers or labels. I’ve always liked this look:
Pottery Barn
If you don’t want to make them yourself, Etsy is great source for inexpensive number tags: