I guess nothing as of right now. If I'm on a field trip (I have two weekenders this semester and then a month long one I paid for this summer), I'll usually take a chunk of a neato mineral if I find any or some geodes. I have a chunk of white rhombohedral calcite (semi transparent) and a tennis ball sized cube of galena (lead ore) with some purple fluorite growing on it. When I get more money I'll have to start actually getting stuff.
My dad however collects 1950's era American Flyer trains (his from when he was a child still runs, 55 years old + and they're WAY cheaper and WAY cooler than buying anything brand new). He has one like thye picture below. The train is made out of metal and you can put an oil in the top and it'll puff smoke. Very badass. So far he has bought 3 more off of Ebay that are fixer uppers and lets my little cousins play with them over Christmas and stuff, which is a really nice thing to do.
http://www.calicomeadows.com/harrold/882004.jpg