11. Iron Man 2's Tony Stark and Virginia "Pepper" Potts
Tony: Iron Man helmet (store-bought, or DIY by coating a red football helmet with gold foil). Supplement this with a form-fitting red top and form-fitting red pants, paired with gold elbow and shin pads. Duct tape a touch light to your chest.
Pepper: A sexy, gray, all-business skirt suit, a blonde bun, heels and legs that go on for miles.
Cute & Clever
12. Tree & Koala
Tree: Brown pants, brown shirt, leaves made of green cardboard or fabric, pinned to your clothes.
Koala: Gray pants, gray shirt, gray face paint with a black oval around your nose. Remember to give the tree plenty of hugs, so people can see you in your "natural" habitat.
More from YourTango: Was Angelina Jolie's Preventive Double Mastectomy Too Drastic?
13. Double Rainbow
Both people wear brightly colored clothing and paint rainbows on your faces with face paint.
Alternate: Rainbow and rain clouds. One person wears bright clothing and paints a rainbow on their face, the other wears dark blue and gray clothing and paints their face white and gray. Bonus: Cut rain-drops out of cardboard, color them blue and pin them to your clothes. Pin or tape clusters of cotton balls on your clothes to represent clouds.
14. Artist & Painting
Artist: Paint-splattered clothes (overalls if you're going modern or a black cape if you're going old-fashioned), painting palate (can be real, or made from cardboard), paint brush.
Painting: Take a large, rectangular cardboard box and cut a rectangle out of one side, so there's about two inches of cardboard left around the edges. Then put the box over your head so you're looking out of the hole you just cut—you're suddenly inside a frame. The painting can dress up like a famous painting (think Mona Lisa or Girl With A Pearl Earring) or be an original work of art.
15. Andy Warhol & Marilyn Monroe
Andy: Black turtleneck, round sunglasses and white hair. Really committed folks can bleach their hair, others can wear a white wig or buy white hair spray.
Marilyn: Pale Pink foundation, aqua eye shadow, crimson lipstick, yellow wig or hair spray, a la the famous pop-art portrait Warhol created of Marilyn after her suicide. Wear a white or black halter-top dress, like this one from American Apparel, which can be styled several ways.