Grant, Frank and Nina. Frank took one of those "fake butt" things, cut out eye holes, glued wig-hair all over it, attached a strap-on dildo, and transformed his entire head into a giant cockn'balls. I'm not really sure what the Star Trek shirt had to do with anything...
Nina, Grant and Viola. Grant's horns came off because he was so fervently making out with Nina...see how she's missing make up and he's got white shit all over his face? Where's her hand anyway? Jesus!
Grant, dressed up as Pan (the horny god of Baccanalia, appropriately enough) and Nina dressed up as a wood-nymph (they were supposed to be from a Midnight Summer's Dream).