It is a final version regarding the shape. I did it with ISO CSG from
Christoph Hormann:
    4 spheres,
    3 planes,
    2 torus,
    6 cones.

I am not satisfied by the tentacle aspect. It seems to me that the color is
changing - I'm not really sure. How to get a more plain color.
One precision, I'm color blind, so the trial ae not only long to render, but
they are not really usefull for me.
I've used this description:

#declare ITent = interior {
        ior IOR
        media {
                scattering {
                        1,
                        rgb<0.015,0.007,0.015>
                }
                intervals 1
                samples 5
                method 3
                density {
                        bozo
                        scale 0.5
                }
        }
}


#declare TTent = texture {
#if (Finish > 0)
        pigment {Clear * 0.998}
#else
        pigment {Clear * 0.8}
#end
        finish {
                phong 0.01
                phong_size 40
                conserve_energy
        }
}
...
#declare Tentacule = isosurface {
        function { TentaFct(x*(1+0.006*(6-y)*sin(12*atan2(z,x))),
select(y,0.75*y,y), z*(1+0.006*(6-y)*sin(12*atan2(z,x))) ) }
                max_gradient 2
                contained_by {
                box { <-6,-15.2,-6> , < 6, -0.3, 6 >  }
                }
#if (Finish > 0)
        hollow
        interior { ITent }
#end
        texture { TTent }
}

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