Yeah you read that correctly, yet another use for spent coffee grounds! You can grow your own mushrooms in them.Here is a link to a site that will give you in-depth instructions on how to grow them and a few places to purchase mushroom spores. GrowVeg.com
Mushrooms are very good for you nutritionally and this looks like too much fun. If you try this we would love to see some pics of your mushrooms growing out of your own coffee grounds.