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Pic related is kind of neat. They're called Sequin Surprise. It's a large plush that comes inside a giant plastic egg, so the surprise factor is there.
The only downside is that they all include a smaller egg with a little figurine that you can stick on top of pencils. If your niece is still at that age where she wants to suck off everything I'd advise against it. My own little niece is turning 4 this weekend so this product in particular was on my mind.