I've owned 2 DeLorean cars (will get a 3rd one of these days), so I've got loads of DeLorean paraphernalia... scale models, dealer brochures, posters, books, magazine advertisements, newspaper clippings, videos, shirts... lots and lots of junk

.
I seem to have a small collection of crystal balls going... I'd probably own more if I had more money. Damn things are pricey!

That could probably be lumped under the Fleetwood Mac header though, so disregard!
I've got a love for most anything mid-century modern... I have funky mod furniture, flip clocks, lamps, stuff like that. I have a thing for the 1960-1990 time period (hence Fleetwood Mac and the DeLorean), and have a growing vintage clothing stash too. Though I wear it everything, so it's not really a collection at all.