How about another type of special patches that would be for digging for treasure/fossils. Most of the time you'd get fossils and could collect those for a trophy or to put in a museum, but a small percentage of the time you'd get a treasure.
I totally need to get animal crossings back from my brother.
Don't get me wrong. I like animal crossing. But for my money, I'd rather have the devs focus on adding new unique things rather than fossils, fishing, and cicadas, all of which I've seen mentioned on these forums. Just my 2c