This in an 'in-progress' base that will be used for a Nurgle demon. It is a design that I sculpted years ago. I think I used it for one of my Grey Knight characters back in the day...
The original base was done the usual way, with Sculpey and polystyrene tubing.
I made a one piece mould of it, which means every so often I can cast one up for myself. :-)
Also, I posted another preview video to YouTube: