I remember finding these as a kid and believing in fairies. This is really a terrible photo-- they are so much more charming in person. You can find them growing on wood chips or bark mulch. I just read that the little "eggs" contain the spores for the mushroom, and that when rain drops hit the nest-like shape, the little eggs are splashed out, and this is one way for the mycelium to spread.
Speaking of mycelium, have you read Mycelium Running by Paul Stamets? His platform is that mycelium can save the world! Even if you don't share his complete enthusiasm for fungi, this book is a wonderful resource and an interesting read too.