There are already several HTC EVO cases out there that take a silicone skin + hard plastic shell combo approach to keeping the handset protected from harm. The OtterBox Commuter Series (review here) and Seidio Innocase Active (review here) are two of the most popular examples and while both are good cases, neither one was inspired by the remains of a dead fish.
And that's obviously why something like the Fishbone Design Hybrid Gel Protector case, which sells for about $15 and is available in some very un-fishlike colors (see below), has a rightful place in the market.
Besides, it would just be unfair for fishermen, cat lovers, and sushi connoisseurs to be disregarded by EVO case manufacturers.[Amazon]