A few days back (before Cupcake has posted his) I've designed this
Chuul. I didn't fold and post it right away because I had to make some suitable duo-colour paper first.
As
Cupcake already mentioned a Chuul is more or less a very lobster-like creature. To make it a distinguishable model a main feature are the tentacles, so in my design I've focused on those, putting them along an edge to be able to colour-change them.
This (first attempt) was folded from a 32cm square of triple-tissue paper, one layer of red and two layers of yellow because with only one layer of yellow the red shone through too much and there was almost no contrast between the two sides.
Expect a CP to come to
my blog during the next days
Edit:
Blog has been updated.