My shed is unique because it was built entirely to my own design from reused pallets and old timber posts at a very low cost, and has had many man-hours spent on it filling in every gap in each pallet. Now it stuns friends and neighbours because they never thought I had it in me to build, plus it feels more rigid than my house (which I hasten to add, I did not build)!
With no building experience or handbook, and only a vision and some sporadic moral support from a mate, it took three months to construct and was done entirely single-handedly.