Photo Bob from NJ. @ About.com: Family Crafts
Make this mother/baby spider and web costume out of socks and string - visit MarthaStewart.com for details.
Go as stoplights by wrapping touch lights from the Dollar Store in red, green and yellow tissue paper and duct taping them to black clothing with black duct tape. Further details at Cup of Delight.
Photo: Cup of Delight
Pin pink boas to a shirt and make the clever hat with the template at Attempting Aloha with glitter foam, googly eyes and a glue gun
(via Dollar Store Crafts)
Photo: Attempting Aloha
This Medusa costume can be made by weaving dollar store snakes into hair and pairing up with an old bridesmaid dress (Marthastewart.com)
For instructions on making a no-sew superhero cape you could top off a pair of sweats with visit Train to Crazy with guest post by Little Pink Monsters
Photo: Little Pink Monsters
Make a classy Southern Belle costume using an old telephone book, scissors and a glue gun Photo: Shared From Way Over Here
Glue silk leaves to a dress or jacket for a swamp monster costume - instructions at Martha Stewart Photo: Marthastewart.com
This clever witch costumer made out of black trash bags would be great for teens and adults (would not recommend for young children though - could be a saftey hazard) - instructions @ Martha Stewart
Use sweats, felt and a blanket to make this adorable "Pig in a Blanket" costume - tutorial at Real Simple
Photo: Glenn Glasser, Stylist: Kristine Trevino via Real Simple
If you have any to share, please feel free to post the link the comments section.