The Welly Boot Box - ingenious combination boot jack & door-side storage for two pairs of garden Wellys (Wellingtons) - or any other boots, I should think. I could see doubling the length to accommodate a family - Also serves as a convenient seating bench
As I grew, I would put plans that I felt safe and secure in changing to my taste, simply a bit, here and there. So why simply limitation yourself to developing furniture? Chairs are typically neglected woodworking tasks.