How? Find out after the break.
Google announced yesterday that it's updated Picnik's photo editor with new Halloween-themed effects. The free web app lets you upload your pics and add stickers, costumes, decorations, and creepy fonts to your images, giving you the tools to turn you (or your pals) into vampires, zombies, and ghosts.
It's an inexpensive way to get in on the Halloween fun, without all the fuss of wading through your local costume shop. Besides, it's the pics on Facebook that really count, right?