Any ideas on how to make a 3D fish or fish cake will be helpful. I have some ideas in my head but want to see if anybody has helpful hints or something better in mind. Thanks.

I'm not quite sure what you had in mind, but I did one last year http://cakecentral.com/gallery/1684783 and it wasn't as hard as I thought it would be. Just needed some patients. lol. Let me know if you have questions and if this is what you wanted to do.