I got a chance to play DnD 5e over the holidays it looks just like this is turning into a regular thing! I am so excited about this I might pee my pants.
One of the funnies events that happened the adventure was that the party was attacked by a Dark Mantle. Okay so the attack wasn't funny -- at least to the character on the receiving end of it. When we saw the name we quickly transformed it into something wrong. Really wrong. Dark Mantle became Dark Taint. It was so funny that one player suggested that I modify a figure to commemorate the <dramatic voice> Dark Taint </dramatic voice>.
As you can see, I am no sculptor as you can see, but hey its my first effort. I've filled gaps and re-positioned arms using green stuff but I have never created anything from scratch before. The figure is a Reaper Bones miniature I got from a Reaper Kickstarter but the Dark Mantle is all my work. I'm pretty happy with the results although I feel like I will do a much better job if I did it a second time. For one thing, I would make it smaller. There isn't really a size reference in the monster manual but after sculpting it I think it should be just large enough to cover a figures head. Secondly, I would do the basic shapes first then add details later.