i was looking at the whale (blue whale) art in-game last night. There are a couple variations I've seen. One swims in a circle, round and round. The other loops around in and out of the water. I would think that one could appropriate that whale art (the one that loops in and out of water) and turn it into an orca pretty easily. it already has the tail in the correct orientation, it has the blowhole / mist-puff already too. so you'd just need to tweak it a bit: stretch out the dorsal fin, taper the head, and paint!
easy on paper at least.
easy on paper at least.