I seem to collect 'things that might be useful' in my workshop. Also probably tools, preferably power, a typical man obsession.
Although this weekends project proved how useful my 'collection' was when I found 4 tiny screws that fitted my coolbox build. Not that it reduced my 'collection' by much or justified the other umpteen kilos still cluttering up the place.
Still got my quite extensive childhood stamp collection, should look at selling that. I could put the $$ to far better use elsewhere.
I also 'collect' good red wines and single malt whiskies but those never seems to grow by much for some weird reason....

not sure why ...