A while back, I posted a picture of a 
crocheted mushroom I gave to my mom for Christmas.  I had so much fun making it that I made a few more and now I've written up a pattern in case someone else wants to make one.  This is my very first written pattern (usually I just make notes for myself) so I hope I did okay.  Please let me know if you find any mistakes.  And I'd love to see pictures if anyone makes one.  :)
Amigurumi MushroomMaterials:worsted weight yarn in one or two colors
G hook (or any hook that gives you a tight gauge)
stitch marker
fiberfill
yarn needle
contrasting color yarn (optional)
Gauge:  not important, but should be crocheted tightly
Pattern note:  This pattern is worked in spirals--do not join at the end of each round.  Use a stitch marker to indicate the beginning of rounds and move it after finishing each round.
Two color mushroom:Color A - tan worsted weight merino wool
Color B - red worsted weight merino wool
StemRnd 1:  Using color A, make 6 sc into 
magic adjustable ring.
Rnd 2:  2 Sc in each sc around.  (12 sc)
Rnds 3-9:  Sc in each sc around.  (12 sc)
Cut yarn and fasten off.
CapRnd 1:  Using color B, make 6 sc into magic adjustable ring.
Rnd 2:  2 sc in each sc around.  (12 sc)
Rnd 3:  *Sc in next sc, 2 sc in next sc;  repeat from * around.  (18 sc)
Rnds 4-5:  Sc in each sc around.  (18 sc)
Rnd 6:  *Sc in next 2 sc, 2 sc in next sc;  repeat from * around.  (24 sc)
Rnd 7:  *Sc in next 3 sc, 2 sc in next sc:  repeat from * around.  (30 sc)
Rnd 8:  *Sc in next 4 sc, 2 sc in next sc;  repeat from * around.  (36 sc)
Rnd 9:  *Sc in next 5 sc, 2 sc in next sc;  repeat from * around.  (42 sc)
Rnd 10:  *Sc in next 6 sc, 2 sc in next sc;  repeat from * around.  (48 sc)
Rnd 11:  *Sc in next 7 sc, 2 sc in next sc;  repeat from * around.  (54 sc)
Rnd 12:  *Sc in next 7 sc, sc2tog over next 2 sc; repeat from * around.  (48 sc)
Rnd 13:  *Sc in next 4 sc, sc2tog over next 2 sc; repeat from * around.  (40 sc)
Rnd 14:  *Sc in next 3 sc, sc2tog over next 2 sc; repeat from * around.  (32 sc)
Rnd 15:  Sc2tog around.  (16 sc)
Rnd 16:  *Sc in next 2 sc; sc2tog over next 2 sc;  repeat from * around.  (12 sc)
Cut yarn and fasten off.
If you would like a face on your mushroom, embroider it now with the contrasting yarn.
Stuff cap and stem with fiberfill and whip stitch together.