I would take a poke at the green faced one ... I would SO feel like Captain Kirk ... the other ... I have turned down blow jobs from better looking than that ... and I was drunk too.
Now your just been harsh there OIIIIIIO, Im sure she's a lovely girl. I dont like here costume much though. Looks a bit too soft and comfortable to be anything anybody from the Emperium would wear.
Onto the 'build yourself a costume', the only one I have every thought I could pull off would be tau, just on the ground thats I am such a short ass I cant see any other race I could be. That would be faily simple to do design wise, I'd just need some way of hiding my gut.