This reminds me of a Super Mario Brothers mushroom. It's very important that you restring all the beads otherwise it'll be too soft at the top to hold up the shape.
30 - 4mm bicone beads (green)
size 11 seed beads (transparent)
size 9 seed beads (white)
90cm fishing line
1 - 2" head pin
1 - 4mm fire polished bead (white)
Round Nose Pilers