Hey Guys,
Figured I'd give this a shot, should be uploading some pictures of my ideas soon. This is all for the demoman:
1) A new Stickybomb Launcher - the Flying Knives of Kaboom! (essentially knives with explosives attached to them)
2) A new Grenade Launcher - the Bottle Goes Bang! (explosives inside broken beer bottles)
and 3) A new hat - Kaboom! (I'm taking a mask shape and plastering the smiley face on paper that the demoman reveals when he does one of his taunts)