If you want to make your iPad look like it just got back from Disneyland, the Amplifiear is the way to go.
Amplifiears are a little more than mouse ears, but not much. No tech here, just curved semi-circles that catch the sound coming out of the iPad’s rear speakers, and send it out towards you. The Amplifiears, true to their name, do manage to raise the max volume of the iPad. The manufacturer claims that the little discs can up the volume by as much as 10 dB.
Unfortunately, you won’t be able to get the full mouse ears effect, unless you really want to buy two and just stick one on the opposite, non-speaker-having corner of the iPad. Which, I mean, if that’s your thing, go right ahead. Otherwise, you can pick up just the one Amplifiear for $25 from uncommongoods.