Back when I lived in an apartment, Aaron got me a Rock Tumbler for Christmas. I tried to make shiny shiny rocks, but the Rock Tumbla (we like to call it that sometimes) was so stinkin' loud, I was worried it would disturb my neighbors... I had to stop tumbling.
Recently, I was rooting around in my attic when I found the packed away Tumbla and since I now have a basement it was time to fire it up. Of course to make shiny shiny rocks it takes three steps... coarse, medium and fine polish... each step taking two to three weeks.
We almost went mad from the constant rumbling noise in the basement, but a month later and the rocks are done!