Departed modellers 'left overs'
And all my drawing equipment from when I was working - ink pens, pencils, adjustable set squares, compasses, scale rules etc. I eventually took my parallel motion drawing board stand down the tip as it was taking up too much room, but kept the board. The French Curves and Circle Templates are useful for modelling though and I've added a set of Dressmakers Curves for bigger work.
Then there's all my DIY and garage tools and photographic equipment, the list goes on!
Chris