Here's something really exotic! This is a Sonic X pencil case from Africa. (South Africa, to be precise!) You don't really think of Africa being dotted with McDonalds' restaurants...but some of the countries do have them. This is a plastic and 3-color pencil case with bonus keychain. You can see SonicX is written in raised letters toward the middle. The keychain is of the yellow Chaos Emerald. Were there other cases with different emeralds? This is a cool collectible from an unexpected area! 
The Chaos Emerald contains a magnet. If you hold it over a marked spot on the pencil case, it will spring open. You can also open it by hand. Other european McDonalds also had this case available as a prize. Info by Metal Mandible. It's been found in Spain, Greece and the Netherlands!