I suggest you guys to get someone who knows clay modelling and ask them to create miniature versions of the Holomons you want in 3D. It's way better than wracking you brain in my opinion. I'm sure someone with a little bit of experience with clay modeling can help you guys out and makes this whole process faster. Just a thought :)
Also I saw an Adobe Photoshop presentation where a 2d image is created to 3d instantly using their new ai feature. Maybe look into that as well.