Tzeentch or Slaanesh would be the best bet for Cthulian esch creatures  but despite what GW would have us belive there is more than just the Chaos Gods out there like the C'tan since the Necrontyr did not get them all. As for a fringe world close to the Eye of Terror is not THAT crazy due to the fact that if you are close to the Eye you are also close to Cadia and could [s]easily[/s] never see some Tactically Geniused BaneBlades and Warhound Titans pop up from that pebble right behind that Chaos Lord and his [s]army[/s] Smoking crater.

I would like to join if I may. Love the Guard so wouldn't mind playing one of them, perhaps a Mordian Iron Guard Rough Rider or if there are to many Guardsmen right now I guess I could go Ork Freebooter since "Dey iz in it for da teef an da good fightin!" in short most likely to work with the group the most, that or a blood ax. My main team is DE and IG though so I could RP them better. 

As a side note I am assuming we need to avoid teams that generally :airquotes show no fear :airquotes like Dark Angels or *My favorite* Death Korp of Krieg.