Fish Blanket Update

I've been knitting fish all week so I decided to lay out the pieces again tonight. Here's how it looks so far:

Right now it would be a nice sized baby blanket, which was my original intention. But, now I can't decide if I want to stop at this size or continue to make it larger into a throw size. I could either add dark brown fishes around the entire edge using yarn I bought to make a brown & pink fish blanket, or buy more blue and tan to continue in pattern. Thoughts?