For the first I went with an organic look, lots of tentacles,eyes and twichy parts; however I felt it was a bit too Souledge(love that weapon).
So for take two I went crystal and wood which made them look less sinister than the ones below.
Third time did the trick ( in my modest opinion) by going with a bone/gall look, takeing the organic part and the crystal/wood and squishing them together.