Wash lady and basket of laundry - You have to have a broom skirt, and shove a pillow on the top of your bottom and then tie your hair up with a bandana and add huge monster boobs, curlers and smudge your face a little like you've been working all day. Then cut the bottom out of a laundry basket and add socks, underwear, empty soap boxes, empty fabric softener, clothes and your mate goes as the laundry complete with clothesline and pins
Fortune Cookie and a Chinese Menu - this one is great if you can find a huge piece of foam and spray paint it and then have a roll of paper and write fortunes on it that people tear off all night long. You pull the foam up to resemble a fortune cookie and your partner goes as a Chinese menu with items like One hung Lo...etc.
Pimp and Hooker - That one was actually fun until I bent over to play pool and shot more than a cue ball. Was a very short dress.
I prefer traditional costumes - how about the Mummy and a sexy Egyptian Goddess? Easy costumes....a sheet, eyeliner and some jewels for her - some gauze for him...
Best of luck....