Today I submitted a deviation to the Sietch : it's a concept of insignia for the Fish Speakers. As i read some times ago the article of the dune Encyclopedia upon the origines of the Fish Speakers, there are some details on what could be their token. A Vesica Piscis, or a fish bladder (http://en.wikipedia.org/wiki/Vesica_Piscis) crossed by 3 lines. After, it is a matter of imagination :)
I submitted as Fav to the group Package-It (http://package-it.deviantart.com/) a template for Starbucks Tumbler : a model of them is customizable, means you can remove the insert inside and replace by one of yours. you just need the right shape, and "job is