BLUE GP OP??
So you thought blue ez was hot? Let me expand your mind into the world of blue Gang Plank. First you want to set up your masteries with as much lifesteal and regen as possible.
Ferocity:11 Resolve:18
The point of this build is too out sustain most champs with your w while doing great damage and using grasp of undying efficiently. The bonus stats also give your ult a lot more damage per wave and make gangplank sorta tanky. So far it has worked well against an ahri, jax, and anivia. It can also be played in any lane including troll pick support. Overall i think this could be one of the strongest builds in the meta.
Starting Items:
Dorans ring and 2 pots, this is your weakest point in game farm with q and get w second, if you can effectively kite your match up you can play aggressive and spam q because of the mana regen from dorans. 
Early items:
Rune glave and tear first, after this you should start building up rod of ages. even though this build path is weird you will have extreme power spike throughout the game.

Essential Items:
For this build you need muramana, iceborn gauntlet, and rod of ages and IE. I prefer swiftness boots for kiting and gp's passive plus the tenacity works great for escaping with w from bad situations. The last item based on how the game is going, usually i would choose an armor pen item like black cleaver or a defensive item like spirit visage.

It will be difficult and time consuming to explain all the aspects of this build but the best way to learn about it is try it out, but this build is good because his barrels proc free stacks, spaming w because of a large mana pool gives you a huge advantage in lane, marumune plus ie and runeglave allows you to delete squishy targets, your semi tanky with huge sustain from w wich scales in ap and missing health, and its incredibly fun so get out there and try it!
btw... the game i played in the match history link was me as gangplank against jax. We had a trolling malz who tried to feed and leave but with great teamwork me and my team were able to ace multiple times and force a forfeit.