My Dutch sister-in-law has a knack for sourcing vintage finds. She and my brother put together this shelving system in their home office using wooden crates they found at an Amsterdam market.
Below: Recreate the look with vintage wood crates from Antique Mystique ($15 each):
Below: In the UK, Willow & Stone carries wood apple crates for £20 each.
Below: Baileys Home & Garden offers vintage apple crates for £18 each.