This is just a build that i just thought was kinda funny and its a bit fun when you get goin.
for runes i get Greater marks of desolation, Greater seals of vitality, and Greater glyphs of might. For Quints i get Greater Quintessence of Desolation.
For items i start with cloth armor and 5 hp pots, When you get the cash go grab razors and turn that into a wriggles for boots i get swiftness or merc depending on their team makeup, grab a black cleaver, frostmallet, starks or bloodthirster, and finish with a atmas if you have the HP gunsos for attack speed or malady for the attack speed and the magic resist reduction.
Get Dragon strike, Banner ,Sheild. Level your banner then dragon then shield and get your ult as you go.
Creeping / Jungling
Start at golems then get wolfs get wraiths and repeat. Always gank when you are needed or if you solo lane needs help. Try to pick up firstblood or help a mate get it. Good solo laners for Jarven to have on your team are GP, EZ, Ashe, Annie, Twich, Viegar, Rammus, and Ryze. Picking up as many ganks as you can or assist is critical for this build so always try to get many assists untill you get Razors then you can go for blue and get red as you need. Jarven is hard to get Dragon alone with so try to get a team mate to help if not then you should just go ahead and gank or continue you jungle rotation.
Wriggles, Boots swift or merc, Black cleaver, Frozen mallet, Starks or bloodthirster, Malady gunsos or Atmas
The last thing you always want to know is that jarven has great synergy with noctern in a team battle and is great in team fights.
...DEMACIA... Get some