craftgrrl | Macbeth english project

For a group project on Macbeth, I have been assigned to do the visual. Our group's theme is "manhood". I have some ideas but I'm lost to how I'd pull it off. I'm also open to more ideas in how to represent manhood.

For those of you who haven't read the story(or even those who have), our group has decided to say the when manhood is challenged, or whenever manhood is brought up in the story, bloodshed and violence soon follows.
Sooooo....for my visual I was thinking like maybe some kind of 3-d muscular arm holding a bloody dagger. But I don't know how i'd do that. paper mache? clay? ehhh...i'm so lost. and what would I put the arm on? or maybe i could do some kind of big ego head...because whenever the characters manhood gets challenged they're like "okay..ill go kill someone."
any ideas would be great. And I'm so stupid at this, so details in how to do this would be super-duper helpful.
Thanks so much in advance.