Ok we all know that sunkens are cheaper than they were before, and they're quite effective as well. What better way to attack someone than to use offensive sunkens. Well this obviously has it's limits, creep and the time you perform this. It should only be done early in the game, where you can find your opponent fast enough. You must also build your spawning pool before your opponent can finish his. Another way to cheese your opponent would be to cancel the structure if he/she tries to use drones to kill your creep colony, and run around, just to come back and start building again.
Here's some of things you should be aware of. A sunken colony takes about half the building time of a spawning pool, it takes a creep colony to form in half the time of a sunken, a fourth of spawning pool. Sunkens cost 125 minerals, and gives you a 400 HP, 40 explosive damage structure. Basically if you sent one or two drones to the other players base, and build creep colonies, you would have to synchronize the completion of the spawning pool and creep colony.
A creep colony finishes very fast, and starts off with 400 HP, making it impossible to kill with just drones. Even if this attack fails, it forces him to build zerglings early since he didn't plan to build a spawning pool as fast as you, and most likely slowed his mining since he'll probably use drones to attack as well. You can then follow up with zerglings of your own to finish off his base since you are so close. Maps I would try this on are hunter-sized maps. Where you can scout your opponent fast, and find what species he is.
