Starting Warhammer 40K. Need help with color scheme.

So, if anyone here even plays Warhammer 40K, you know what the Tyranid is. They are essentially hungry bugs with skeletons and bio-weaponry.

There are three main color scheme options most people use, following either Red, White, or Bone colored skin and Blackw/Teal, Black w/ purple, or Red w/ Black carapace on top of them. I was thinking of making them Black and white with miniature top hats.

Top hats? Yes top hats. Just to say that my bugs are civilized, but still hungry. I just don’t know 1. If this is a good idea or just novelty and 2. Where to get 6mm top hats.