Here's a finished pre-2015 biscornu! I made the same pattern before for a swap and really liked how it turned out. I changed some of the skull colors based on available threads, but it's otherwise the same.
I chose an Ink Circles design for the bottom and a Day of the Dead free pattern I
found for the top, adding some flowers to fill out the stitchable area.
I dyed the Aida cloth with tea so the white skulls would stand out
against it. I followed a tutorial through Own Two Hands when putting the biscornu together.
It's a bit overstuffed, but that shouldn't be a problem for the recipient. It was just a problem for me when putting in those buttons to get the final shape. Trying to not bleed on the biscornu wasn't supposed to be a part of the finishing work!