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Picture of LED Super Mario Piranha Plant
We are going to make an Arduino control LED Piranha Plant :]

Step 1: What you'll need

Picture of What you'll need
Arduino Uno
9 Resisters
9 LEDs - Red, Yellow, Orange is best since they need less amperage
PIR sensor
9v battery 
arduino wall plug (you'll be cutting the connection so that you can connect it to the battery. 12v plug in will over heat the arduino)
LOTS of wire
Plant plot of your choice - plastic is easiest
8in styrofom ball
Large white pipe cleaner
Paint - green, red, white
paint brushes
PVC pipe
saw - to cut pvc pipe
hot glue gun
45 degree elbow pipes - 3
model magic - doesn't matter which color
foam core - for teeth
foam sheets 
 
That is wicked sweet :) You should enter this into the Holiday Gifts Contest!