Need help converting SM into Chaos

I've bought the 'Assault on Black Reach' battle box to get me a lot of orkz, and now i have some space marines lying around. I don't want that, i want chaos marines lying around!

Any easy ideas how to convert so it looks nice? I've tried a bit with giving them horns (fantasy bows modified and glued), but this doesn't quite seem to be enough.

Any ideas welcome - even if i can't do them (i suck at converting/painting, but i'm trying and learning hehe)

Add spiky ornamentation around the edge of shoulder pads, feet etc. with green stuff, add scary symbols onto the actual shoulder pad, add guts hanging out and pustules for Nurgle, MORE spikes for Khorne, bits of leather and kinky stuff for Slaanesh, eyes, twisted faces and flames for Tzeentch. Making the commander in the box set look chaos-like will be a challenge but definitely doable! Alternatively you could just do it by giving them a sinister paintjob. I've seen some really well done death guard marines that weren't that far off normal marines but with a plaguey paint rob and nice rust effects!

Other stuff would be to just add any sort of grim bits that you might have lying around ie skulls, different close combat weapons especially for the commander. It also depends how well your bitz box is stocked and what sort of chaos marines you're going for...



...if they're really bothering you you could just send them all to me, I'm sure I could find a home for them!

Tentacles! Woooooo! And skullllllllllllllllllls!

For Alpha Legion, just paint them in Alpha Legion colours (blue with green rim and silver metals). I believe they do not have that many mutations.

For other chapters, I think painting them in the appropriate colour and adding Chaos symbols to the shoulder pads, as well as the odd spike, skull and mutation should serve you well

Yeah I'm going for pre-heresy Emperors Children
as in pre-heresy but on the edge of converting into chaos so they'll still have skulls and horns and the like! (that's the fun part of being a chaos marine, wearing horns on a helmet!)

The colours i'm using will be dark purple for armor and gold for trims - a bit sinister but still niiiice

Btw, thanks guys Appreciate the help!

I'm thinking about converting the terminators to possessed or obliterators, but i'll need a few years or ten to practice my greenstuff skills before that project haha

Preheresy had no skulls or spikes, it was older armour. Check out Bell of Lost Souls and search for preheresy marines, they are the authority on it. They went so far as to write a preheresy rule set called Warhammer 30k

Haha nice! And yeah i know pre-heresy was just plain marines, but i'm goin for the greyzone where they started using noise weapons and put horns on their helmets.. So it guess i'm going for mid-heresy haha.. will chech the link out later today when i have time thanks a lot