i just finished making a garbage bag ghost with led blinking eyes. I hope you build one also and have as much fun as i did.

Step 1: Materials

The materials are as follows-
   -two ultrta bright leds
   -garbage bag
   -8 pin dip chip holder
   -rubberband
   -paper
   -arduino
   -4 ft pvc pipe, 1/2 or 3/4 inch
   -wire for connecting

Step 2: Prepare the Chip Holder

solder all 4 pins on each side to a wire for each side.

Step 3: Insert Leds

put the leds in parallel across the holder and bend out each one.

Step 4: Code

not much more to say. connect red wire from led assembly on pin 10 and black on ground here it is-

void setup() {
pinMode(10, OUTPUT);
}
void loop() {
digitalWrite(10, HIGH);
delay(3000);
digitalWrite(10, LOW);
delay(100);
}

Step 5: Packaging It Up

take the arduino board and crumple some paper around it.
finish with a full sheet and wrap it around the crumpled sheets
pull the trash bag over the assembly and rubber band it at the bottom with the pvc