Re-purposed / Recycled Crates
By the way, I HATE the newest, cutsie, pretentious word - "up cycle" - you're being creative and reusing what would otherwise be called JUNK/TRASH! Repurpose / recycle - just call it that! Up-cycle is putting lipstick on a pig!
Easy crate bookcase with table top. Makes for a great console in a hallway or behind a couch, or as buffet-style serving in a dining room.
Hanging wooden crates for storage (shoes gloves hats next to front door)--good for garage or mud room. Change it up to colorful milk crates and it could make useful toy storage for the kids room!