I dunno, I really fail to see how these starters are unoriginal... Everything people compare them to doesn't really make sense to me.
Tsutaaja: The only similarity it has to Treecko is the fact that its green, a reptile, and standing on two legs. Thats it. Side by side there's little similarity. I think Tsutaaja is better than Treecko anyway, but hey that's just what I think.
Pokabu: Okay... Turtwig? Really? They have no resemblance besides the fact they both walk on all fours. But so do dozens of other Pokemon. And yes, its a pig, so it's going to have a curly tail. That doesn't mean its copying Spoink and Grumpig.
Mijumaru: My favorite of the starters
Anyway, it really has little similarity to Piplup. They are both cute small and stubby, but so are many Pokemon. And yeah they are both shades of blues. They are water type starters, all of them have been blues. And besides, Mijumaru's nose is brown. (The scans made it look orange but, look at the official art.) Piplup's beak is yellow. They don't really look similar at all.
But that's just me