I would look at the lack of these types of patterns has an opportunity. My guess is, there might be a market for these types of patterns, after all there are a ton of religious, and wildlife patterns out there, so that market is kind of saturated. I made a bunch of "Smoking Permitted" and Designated Smoking Area signs for a friend, cause he was unable to find any decent commercial ones that he liked, so I made up a few designs, and he chose the ones he liked.