Another cool build to try before its gone: Ingenious Predator Rengar
Not sure how long these runes are going to last in each tree with the next few patches, but I had time to play with this Rengar build this weekend and it was a blast. Jungling was insanely fun. Ingenious Predator Rengar isn't a new build, but it's not exactly a popular build either. If you like one shotting people at Mach 3, check this out before it's gone.
D: Predator, Lethal Impact, Eyeball Collector, Ingenious Hunter S: Celerity, Ultimate Hat Precision could work too.
Items:
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Ingenious Hunter lower's the CD on Predator, Youmuu's, Hydra, and Stone Plate. It also lowers the CD on oracle trinket for ward clearing to build your eyeball collection. Ultimate hat lowers ult CD on top of the 40% from your items.
Pop R, Youmuu's, and Predator to catch anyone and one shot any non-tank you see. Gargoyle helps you survive jumping into the backline during team fights in late game (if there even is one), and BC shreds armor to confirm a kill. Ingenious hunter also lowers the CD of Tiamat/Hydra for insanely quick jungle clearing.
I lost one game with this build against a Warwick, but stomped pretty much everything else. Try it before the changes.