Check the link below for a somewhat weird costume idea using dog masks and what looks like men in black style clothing.
https://www.youtube.com/watch?v=s7TSVYajnBg
Maybe something to consider for next carnival as a group costume. The video itself was taken from a low budget movie named Space Dogz. The dog masks and other animal masks can be bought at: http://www.mask-shop.com/en/latex-masks-83/animal-masks-71/