I made this cute ghost almost year ago and upload it to Thingiverse http://www.thingiverse.com/thing:515168
For this year it downloaded 2300 times.
Try it you'll like it !
Step 1: Download Me!
Step 2: Print Me!
You can print it with glowing in the dark filament and it'll the best stuff for halloween!
P.S. I print it with glowing in the dark ABS, 0.2 and 40% infill