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I made one of those aluminum foil balls
(hexbear.net)
I know I am a few years late to this trend, but I did that thing that used to be huge on the internet and took a hammer to a bunch of aluminum foil and it actually worked! I thought it would be terrible, because every guide I found eventually suggested that you bring out your belt grinder and a bottle of aluminum polish, and I am not a metal worker, so I don't have that. Turns out you can get a very satisfying ball of aluminum with just the foil, a hammer, any kind of flat surface to work on and some toilet paper for polishing.
It's shiny and I made it and I can use it as a stress ball by just tossing it from one hand to the other and feeling the satisfying weight. I love it!
How big was the unpacked foil ball? My autistic child self compulsively collected the foil wrappers from chocolates from all the weddings my parents made me attend, and I sort of balled them up in my treasure chest. If my tinfoil ball is about a half meter across, do you think it will hammer down to bigger or smaller than your current sphere?
It was pretty big of course, but not half a meter I think. So much depends on how tightly it is packed.