YES- Im addicted to my K-cups! I opened one of the cups after use to discover that it has a paper filter in it with a hole through the bottom. I used my Kureig machine to make 2 more holes on the bottom. Put some of my lava rocks from the grow bed, dropped some seeds in it, placed it in my growbed and whalla! One week later..... I can feel a little less guilty about all the K-cups, now that I can repurpose them!