Terran Build Order: Korean 2-Rax Marine SCV Rush

Description: The 2 Barracks Marine and SCV rush is a build that has been around for some time, but has seen an incredible amount of success in GSL 3 from a professional player named Boxer (aka Foxer). The build can be effective against all three match-ups, but is most effective against Terran, Zerg, and is incredibly aggressive. Depending on the amount of SCVs pulled off the mineral line, a player may or may not be able to transition into other builds.

Terran Starcraft 2 Build Order: Fast Expand Four Banshee Build

Description: The purpose of the Fast Expand Four Banshee Build Order is to take advantage of a Protoss players weak anti-air and lack of detection. I would argue that the strongest anti-air a Protoss player has is the Stalker, while the only detection they have is the observer or photo cannon. 

Your army will consist primarily of marines, a couple of ravens, and banshees. The raven exists to negate the stalkers with Point Defense Drone and detect the observer. Meanwhile, marines cleanup the stalkers while the Banshees target the Colossi. 

This'll definitely take some practice, but it's a pretty strong build and is very effective vs. Colossus play.