I've done this using island provinces before - ussually by accident. Invade an island with a small force and you are pretty much guaranteed a rebellion the next year, and each following year if you don't send a big garrison. Crete works good. (It's kinda fun to see how good you can get your general, and how long you can last. If you like small battles this is the way to go.)
You can help keep the rebellions coming by murdering all your prisoners, or executing all the rebels after each year. Your general will start piling on "unhappiness" vices - up to you whether you want him to do that.
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