I'm not one for drawing fanart. However, when model making and conversion is considered, it can be very useful as a concept design process. Here are a couple of Chaos Sisters. One for Khorne and the other for Iron Warriors. A member on the Bolter and Chainsword forums mentioned that the Iron Warrior techmarine reminds him of the Borg from Star Trek.
Here is a link to my Deviant Art page: http://akiyama24.deviantart.com/