Last minute paper spider web decoration tutorial!
http://omiyageblogs.blogspot.com/2011/10/diy-spiderweb-kirigami.html
Really easy origami bat - halloween decoration idea!
http://goorigami.com/single-sheet-origami/origami-bat-halloween-model/1604
Halloween umbrella wreath - so easy to make and no glue!
http://designeditor.typepad.com/design_editor/2011/10/halloween-drink-umbrella-wreath-tutorial.html
Pumpkin decor! wait a minute..
http://www.momtastic.com/diy/170104-diy-last-minute-pumpkin-decor-from-oranges
Pumpkin carving tutorial:
http://thebluebrick.ca/2011/10/13/beautifully-different-pumpkin-carving/
Distressed halloween sign - you could adapt it make any sign you wanted though!
http://www.lilblueboo.com/2011/09/distressed-trick-or-treat-sign.html
Glow in the dark spider web trick-or-treat bag:
Frankenstein’s monster felt bag for trick or treating!
http://radmegan.blogspot.com/2011/10/felt-frankenstein-candy-bag-for.html
Halloween painted spooky spools!
http://thecraftysisters.com/2011/10/09/crafty-challenge-one-spooky-spools/
DIY styrofoam mummies!
http://craftaphile.blogspot.com/2011/10/halloween-decor-mummies.html
Rainbow glitter pumpkins! Not at all spooky, but wonderfully sparkly! :)
http://swelldesigner.blogspot.com/2011/10/how-to-make-rainbow-glitter-pumpkin.html
Cat snood from an old sweatshirt - I love it - also, a great idea for halloween :)
http://clossette.com/how-to-make-a-catastic-kitty-eared-snood-out-of-an-old-sweatshirt/
Halloween lanterns DIY:
DIY Vicious Koala Attack Costume. Tutorial (and another example shown - a dog biting your behind) by Eric J. Wilhelm, founder of Instructables here. Great idea for so many stuffed animals - I mean how many Barneys are at thrift stores right now (and I always wash, in hot hot water, any stuff animal I buy used).
Halloween mummy cookie inspiration!
http://www.thedecoratedcookieblog.com/2011/09/halloween-mummy-cookie-pops-guest-post.html