I 'borrowed' an idea for making custom fiends of slaanesh from a pic I saw online a few months ago. Basically you take a forest goblin spider and combine it with a daemonette. I'm a little unsure of how much I like my effort. Yesterday I thought they really sucked, today they have grown on me a little. They definitely aren't as nice as the ones I'm basing these off of but this was a pretty quick conversion and far cheaper than the actual GW models.